Code No. P0629: Suction Control Valve Battery Short <Except Euro5b>
OPERATION
- The voltage is applied from the engine-ECU (terminal No. 131) to the suction
control valve (terminal No. 1) via the power transistor in the engine-ECU.
- The voltage is earthed to the engine-ECU (terminal No. 146) from the suction control
valve (terminal No. 2).
FUNCTION
- The engine-ECU performs duty control over the suction
control valve.
- The engine-ECU checks whether the amount of current for driving duty is adequate.
TROUBLE JUDGMENT
Check Conditions
- Battery positive voltage is 8 - 16 V
- 2 seconds later after the ignition switch has been in "ON" position or the engine
has started up
- The supply pump and injector are being normally controlled.
- The fuel injection rate is 4 mm3/st or more.
- When the driving duty ratio of the suction control valve is lower than the specified
value, the driving current is higher than the specified value.
PROBABLE CAUSES
- Failed suction control valve
- Short circuit in suction control valve circuit or loose connector contact
- Failed engine-ECU
DIAGNOSIS PROCEDURE |
STEP 1. Connector check: A-47 suction control valve connector |
Q.
Is the check result normal?Go to Step 2.Repair or replace the connector. |
STEP 2. Check suction control valve itself. |
Q.
Is the check result normal?
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Go to Step 3. |
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Replace the suction control valve. |
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STEP 3. Connector check: C-103 engine-ECU connector |
Q.
Is the check result normal?Go to Step 4. Repair or replace the connector. |
STEP 4. Check harness between C-103 (terminal No. 131) engine-ECU connector and A-47 (terminal No. 1) suction control valve connector. |
Q.
Is the check result normal?Go to Step 5.Repair the damaged harness wire. |
STEP 5. Check harness between C-103 (terminal No. 146) engine-ECU connector and A-47 (terminal No. 2) suction control valve connector. |
Q.
Is the check result normal?Go to Step 6. Repair the damaged harness wire. |
STEP 6. M.U.T.-III diagnosis code. |
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Q.
Is the diagnosis code set?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection
Service Points - How to Cope with Intermittent Malfunctions ). |
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