Inspection Procedure 26

INSPECTION PROCEDURE 26: Generator output voltage is low (approximately 12.3 volts).

Generator Circuit:

Connectors:

CIRCUIT OPERATION
- The EMC or PCM controls generator out put current by duty-controlling continuity between the generator G terminal (terminal No. 1) and ground.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE: )
- Malfunction of the charging system.
- Short circuit in the harness generator G terminal and ECM or PCM .
- ECM or PCM failed.

DIAGNOSIS

STEP 1. Measure the voltage at generator intermediate connector B-13 by backprobing.
1. Do not disconnect the connector B-13.
2. Start the engine and run at idle.

3. Measure the voltage between terminal No. 2 and ground by backprobing.
a. Engine: warming up
b. Radiator fan: stopped
c. Headlight switch: OFF to ON
d. Rear defogger switch: OFF to ON
e. Stoplight switch: OFF to ON
- Voltage rises by 0.2 - 3.5 volts.

4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the measured voltage between 0.2 and 3.5 volts?

YES: Replace the generator. Then confirm that the malfunction symptom is eliminated.
NO: Go to Step 2.

STEP 2. Check connector B-13 at generator intermediate connector for damage.

Q: Is the connector in good condition?

YES: Go to Step 3.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then confirm that the malfunction symptom is eliminated.

STEP 3. Check connector B-115 at generator connector for damage.

Q: Is the connector in good condition?

YES: Go to Step 4.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then confirm that the malfunction symptom is eliminated.

STEP 4. Check connector C-111 at ECM or connector C-112 at PCM for damage.

Q: Is the connector in good condition?

YES: Go to Step 5.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then confirm that the malfunction symptom is eliminated.

STEP 5. Check for open circuit and short circuit to ground and harness damage between generator connector B-115 (terminal No. 1) and ECM connector C-111 (terminal No. 8) or PCM connector C-112 (terminal No. 8) .

Q: Is the harness wire in good condition?

YES: Replace the ECM or PCM. Then confirm that the malfunction symptom is eliminated.
NO: Repair it. Then confirm that the malfunction symptom is eliminated.