[13C] MULTIPORT FUEL INJECTION (MPI) <4G69> - - TROUBLESHOOTING - INSPECTION PROCEDURE FOR DIAGNOSIS CODES - Code No. P0622: Alternator FR Terminal System | PRINT PAGE / INDEX / PRIOR / NEXT

Code No. P0622: Alternator FR Terminal System
OPERATION The energized state of the alternator field coil is inputted from the alternator (terminal No. 4) to the engine-A/T-ECU (terminal No. 86).
FUNCTION A signal of the power supply duty ratio for the alternator field coil is inputted to the engine-A/T-ECU. In response to the signal, the engine-A/T-ECU detects the alternator output current and controls the idling speed according to the output current (electric load).
TROUBLE JUDGMENT Check Condition Engine speed is 50 r/min or higher. Judgment Criterion Input voltage from the alternator FR terminal has continued to be approximately battery positive voltage for 20 seconds.
PROBABLE CAUSE Failed alternator Open/short circuit in alternator FR terminal circuit or loose connector Failed engine-A/T-ECU
| DIAGNOSIS PROCEDURE
| STEP 1. Connector check: B-30 alternator connector
| Q: Is the check result normal? YES: Go to Step 2 . NO: Repair.
| STEP 2. Perform voltage measurement at B-30 alternator connector.
| Disconnect connector, and measure at male connector side. Ignition switch: ON Voltage between terminal No. 4 and earth. OK: System voltage Q: Is the check result normal? YES: Go to Step 6 . NO: Go to Step 3 .
| STEP 3. Connector check: C-136 engine-A/T-ECU connector.
| Q: Is the check result normal? YES: Go to Step 4 . NO: Repair.
| STEP 4. Check harness between B-30 (terminal No. 4) alternator connector and C-136 (terminal No. 86) engine-A/T-ECU connector.
| Check output line for open/short circuit. Q: Is the check result normal? YES: Go to Step 5 . NO: Repair.
| STEP 5. Check the trouble symptoms. Q: Does trouble symptom persist? YES: Replace engine-A/T-ECU. NO: Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).
| STEP 6. Perform voltage measurement at C-136 engine-A/T-ECU connector.
| Measure engine-A/T-ECU terminal voltage. Engine: Idle after warm-up Transmission: P range Radiator fan: Inactive Voltage between terminal No. 86 and earth. OK: Switching the headlamps to ON from OFF causes the voltage to fall. Q: Is the check result normal? YES: Go to Step 7 . NO: Go to Step 5 .
| STEP 7. Check harness between B-30 (terminal No. 4) alternator connector and C-136 (terminal No. 86) engine-A/T-ECU connector.
| Check output line for damage. Q: Is the check result normal? YES: Go to Step 8 . NO: Repair.
| STEP 8. Check trouble symptom. Q: Same symptoms regenerated? YES: Replace alternator. NO: Intermittent malfunction (Refer to Group 00 - How to Use troubleshooting/Inspection Service Points ).

[13C] MULTIPORT FUEL INJECTION (MPI) <4G69> - - TROUBLESHOOTING - INSPECTION PROCEDURE FOR DIAGNOSIS CODES - Code No. P0622: Alternator FR Terminal System | PRINT PAGE / INDEX / PRIOR / NEXT

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