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1.Disconnect the engine-ECU connectors B-09 and B-10, and connect check harness special
tool power plant ECU check harness (MB992110) between the engine-ECU connectors.
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2.Measure the voltage between each check harness connector terminal and check harness
connector earth terminal (No. 81 or No. 93).
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3.Connect a needle-nosed wire probe to a voltmeter probe.
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4.Referring to the check sheet, insert the micromini probe into the check harness connector
and measure the voltage.
| note |
- You may find it convenient to pull out the engine-ECU to make it easier to reach
the connector terminals.
- The chart procedures do not have the particular order.
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| caution |
Short-circuiting the positive (+) probe between
a connector terminal and earth could damage the vehicle wiring, the sensor, engine-ECU or all
of them. Be careful to prevent this!
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5.If voltmeter shows any division from standard value, check the corresponding sensor,
actuator and related electrical wiring, then repair or replace.
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6.After repair or replacement, recheck with the voltmeter to confirm that the repair
has corrected the problem.
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Terminal No.
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Inspection Item
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Check condition (Engine condition)
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Normal condition
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1
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Inlet oil feeder control valve
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Ignition switch: ON
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System voltage
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Under the high load operation
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4 - 10 V*
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2
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No. 1 injector
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Engine: While engine is idling after
having warmed up, suddenly depress the accelerator pedal.
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From 9 - 15 V*, it is
slightly reduced temporarily.
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3
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No. 2 injector
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18
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No. 3 injector
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19
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No. 4 injector
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4
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No. 1 ignition coil
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Engine: 3,000 r/min
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0.1 - 2.0 V*
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5
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No. 2 ignition coil
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20
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No. 3 ignition coil
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21
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No. 4 ignition coil
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6
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Starter active signal
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Engine: Cranking
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System voltage
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Engine: Idle operation
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1 V or less
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7
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Exhaust camshaft position sensor
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Engine: Cranking
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2.0 - 4.8 V*
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Engine: Idle operation
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2.0 - 3.0 V*
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8
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Crank angle sensor
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Engine: Cranking
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0.4 - 4.0 V*
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Engine: Idle operation
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2.0 - 3.0 V*
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9
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Sensor impressed voltage
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Ignition switch: ON
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4.9 - 5.1 V
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10
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Throttle position sensor (main)
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- Remove the intake air hose at the throttle
body.
- Disconnect the connector of the electronic-controlled throttle valve.
- With the special tool test harness (MB991658) bridge only the mating terminals of
No. 3, No. 4, No. 5, and No. 6 of the disconnected connectors.
- Ignition switch: ON (engine stopped)
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Fully close the throttle valve with your finger.
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0.3 - 0.7 V
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Fully open the throttle valve with your finger.
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4.0 V or more
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11
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Throttle position sensor (sub)
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- Remove the intake air hose at the throttle
body.
- Disconnect the connector of the electronic-controlled throttle valve.
- With the special tool test harness (MB991658) bridge only the mating terminals of
No. 3, No. 4, No. 5, and No. 6 of the disconnected connectors.
- Ignition switch: ON (engine stopped)
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Fully close the throttle valve with your finger.
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4.3 - 4.7 V
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Fully open the throttle valve with your finger.
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0.3 - 0.7 V
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12
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Applied voltage to the throttle position sensor
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Ignition switch: ON
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4.9 - 5.1 V
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14
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Inlet camshaft position sensor
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Engine: Cranking
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2.0 - 4.8 V*
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Engine: Idle operation
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2.0 - 3.0 V*
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15
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Throttle valve control servo (+)
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- Ignition switch: ON
- Accelerator pedal: fully opened → fully closed
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Decreases slightly from the battery voltage
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16
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Throttle valve control servo(-)
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- Ignition switch: ON
- Accelerator pedal: fully closed → fully opened
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Decreases slightly from the battery voltage
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17
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Exhaust oil feeder control valve
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Ignition switch: ON
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System voltage
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Under the high load operation
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4 - 10 V*
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26
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Engine coolant temperature sensor
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Ignition switch: ON
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When engine coolant temperature is -20°C
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3.9 - 4.5 V
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When engine coolant temperature is 0°C
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3.2 - 3.8 V
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When engine coolant temperature is 20°C
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2.3 - 2.9 V
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When engine coolant temperature is 40°C
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1.3 - 1.9 V
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When engine coolant temperature is 60°C
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0.7 - 1.3 V
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When engine coolant temperature is 80°C
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0.3 - 0.9 V
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34
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Oxygen sensor (front) heater
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Engine: Idle operation after warm-up
(With 2 minutes after the engine starting sequence is completed)
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9 - 11 V*
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Under the high load operation
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System voltage
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35
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Oxygen sensor (rear) heater
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Engine: Idle operation after warm-up
(With 2 minutes after the engine starting sequence is completed)
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9 - 11 V*
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Under the high load operation
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System voltage
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36
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Engine oil pressure switch
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Ignition switch: ON
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1 V or less
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Engine: Idle operation
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System voltage
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37
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Purge control solenoid valve
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Ignition switch: ON
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System voltage
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Engine: 2,500 r/min after warm-up (with 1 minutes after
the engine starting sequence is completed)
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Voltage decreases
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38
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Oxygen sensor (front)
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Engine: Maintain 2,500 r/min after warm-up
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0.9 V or less <=> 1.1 - 1.5 V (changes repeatedly)
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39
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Oxygen sensor (front) offset voltage
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Ignition switch: ON
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0.4 - 0.6 V
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40
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Oxygen sensor (rear)
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- Transmission: 2nd
- The engine speed is maintained to 3,500 r/min or more during an accelerated driving with
the throttle full-open
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1.0 - 1.5 V
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41
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Oxygen sensor (rear) offset voltage
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Ignition switch: ON
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0.4 - 0.6 V
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44
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Applied voltage to the manifold absolute pressure sensor
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Ignition switch: ON
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4.9 - 5.1 V
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45
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Manifold absolute pressure sensor
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Ignition switch: ON
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At 0 m altitude
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1.2 - 1.8 V
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At 600 m altitude
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1.1 - 1.7 V
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At 1,200 m altitude
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1.0 - 1.6 V
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At 1,800 m altitude
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0.9 - 1.5 V
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Set the vehicle to the pre-inspection condition
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Engine: Idle operation
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0.46 - 0.66 V
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Engine: Excessive acceleration
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Varies depending on the negative pressure at the inlet manifold
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51
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No. 1 fuel pump relay
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Engine: While the engine is idling after warm-up, quickly
depress the accelerator pedal
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Decreases slightly from the battery voltage
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52
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Waste gate solenoid valve
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Engine: after warm-up
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Idle operation
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System voltage
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Excessive acceleration
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Voltage decreases
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58
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Power steering fluid pressure switch
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Engine: Idle operation after warm-up
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When steering wheel is stationary
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System voltage
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When steering wheel is turned
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1 V or less
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60
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Alternator G terminal
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- Engine: Idle operation after warm-up
- Radiator fan: Non-operation
- Head lamp switch: OFF → ON
- Stop lamp: OFF → ON
- Rear window defogger switch: OFF → ON
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Voltage rises
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61
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Alternator FR terminal
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- Engine: Idle operation after warm-up
- Radiator fan: Non-operation
- Head lamp switch: OFF → ON
- Stop lamp: OFF → ON
- Rear window defogger switch: OFF → ON
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Voltage decreases
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62
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Alternator L terminal
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Ignition switch: ON
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0.5 - 2.0 V
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Engine: Idle operation
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System voltage
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72
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Power supply voltage applied to throttle valve control servo
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Ignition switch: ON
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System voltage
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73
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Engine control relay
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Ignition switch: LOCK (OFF)
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System voltage
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Ignition switch: ON
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1 V or less
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74
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Accelerator pedal position sensor (main)
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Ignition switch: ON
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Release the accelerator pedal
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0.9 - 1.1 V
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Depress the accelerator pedal fully
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4.0 V or more
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75
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Applied voltage to the accelerator pedal position sensor (main)
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Ignition switch: ON
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4.9 - 5.1 V
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77
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Accelerator pedal position sensor (sub)
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Ignition switch: ON
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Release the accelerator pedal.
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0.4 - 0.6 V
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Depress the accelerator pedal fully
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2.0 V or more
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78
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Applied voltage to the accelerator pedal position sensor (sub)
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Ignition switch: ON
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4.9 - 5.1 V
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82
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Power supply
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Ignition switch: ON
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System voltage
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84
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Throttle valve control servo relay
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Ignition switch: LOCK (OFF)
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0 - 0.1 V
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Ignition switch: ON
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1 V or less
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87
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Air flow sensor
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Engine: Gradually increase the speed
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Voltage increase in response to engine speed
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89
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No. 1 intake air temperature sensor
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Ignition switch: ON
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When the intake air temperature is -20°C
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3.8 - 4.4 V
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When the intake air temperature is 0°C
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3.2 - 3.8 V
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When the intake air temperature is 20°C
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2.3 - 2.9 V
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When the intake air temperature is 40°C
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1.5 - 2.1 V
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When the intake air temperature is 60°C
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0.8 - 1.4 V
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When the intake air temperature is 80°C
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0.4 - 1.0 V
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92
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Ignition switch - IG
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Ignition switch: ON
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System voltage
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96
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No. 2 fuel pump relay
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Ignition switch: ON
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System voltage
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Engine: Idle operation
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1 V or less
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98
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No. 2 intake air temperature sensor
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Ignition switch: ON
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When the intake air temperature is -20°C
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3.8 - 4.4 V
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When the intake air temperature is 0°C
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3.2 - 3.8 V
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When the intake air temperature is 20°C
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2.3 - 2.9 V
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When the intake air temperature is 40°C
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1.5 - 2.1 V
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When the intake air temperature is 60°C
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0.8 - 1.4 V
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When the intake air temperature is 80°C
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0.4 - 1.0 V
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102
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A/C compressor relay
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- Engine: Idle operation
- A/C switch: OFF → ON
(when the compressor is active)
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System voltage → 1 V or less.
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104
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Backup power supply
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Ignition switch: LOCK (OFF)
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System voltage
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105
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Ignition switch - ST
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Engine: Cranking
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System voltage
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106
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Starter relay
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Engine: Cranking
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System voltage
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Engine: Idle operation
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1 V or less
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1.Turn the ignition switch to "LOCK" (OFF) position.
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2.Disconnect the engine-ECU connector.
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3.Measure the resistance and check for continuity between the terminals of the engine-ECU
harness-side connector while referring to the check chart.
| note |
- When measuring resistance and checking continuity, a harness for checking contact
pin pressure should be used instead of inserting a test probe.
- The chart procedures do not have the particular order.
|
| caution |
If the terminals that should be checked are mistaken, or
if connector terminals are not correctly shorted to earth, damage may be caused to the vehicle
wiring, sensors, engine-ECU and/or ohmmeter.
Be careful to prevent this!
|
|
|
|
4.If the ohmmeter shows any deviation from the standard value, check the corresponding
sensor, actuator and related electrical wiring, and the repair or replace.
|
|
|
5.After repair or replacement, recheck with the ohmmeter to confirm that the repair
or replacement has corrected the problem.
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