Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMITSUBISHI2005LANCER EVOLUTION L4-2.0L DOHC TURBOREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESINSPECTION PROCEDURE 26
2005 Mitsubishi Lancer Evolution L4-2.0L DOHC Turbo
Inspection Procedure 26
2005 Mitsubishi Lancer Evolution L4-2.0L DOHC TurboSECTION Inspection Procedure 26
Generator Output Voltage is Low (Approximately 12.3 Volts)
CIRCUIT OPERATION
- The ECM controls generator output current by duty-controlling continuity between the generator G terminal (terminal 1) and ground.
TROUBLESHOOTING HINTS (The most likely causes for this charging system:)
- Malfunction of the charging system.
- Short circuit in the harness between generator G terminal and ECM.
- ECM failed.
DIAGNOSIS
STEP 1. Measure the voltage at generator intermediate connector B-14 by backprobing.
1. Do not disconnect the connector B-14.
2. Start the engine and run at idle.
3. Measure the voltage between terminal No.10 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-14 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-25 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-119 at ECM 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-25 (terminal No.1) and ECM connector C-119 (terminal No.33).
NOTE: Check harness after checking intermediate connector B-14. If intermediate connector is damaged repair or replace it. Refer to Harness Connector Inspection. The confirm that the malfunction symptom is eliminated.
Q: Is the harness wire in good condition?
YES: Replace the ECM. Then confirm that the malfunction symptom is eliminated.
NO: Repair it. Then confirm that the malfunction symptom is eliminated.
Generator Circuit Part 1:
Generator Circuit Part 2:
CIRCUIT OPERATION
- The ECM controls generator output current by duty-controlling continuity between the generator G terminal (terminal 1) and ground.
TROUBLESHOOTING HINTS (The most likely causes for this charging system:)
- Malfunction of the charging system.
- Short circuit in the harness between generator G terminal and ECM.
- ECM failed.
DIAGNOSIS
STEP 1. Measure the voltage at generator intermediate connector B-14 by backprobing.
1. Do not disconnect the connector B-14.
2. Start the engine and run at idle.
3. Measure the voltage between terminal No.10 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-14 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-25 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-119 at ECM 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-25 (terminal No.1) and ECM connector C-119 (terminal No.33).
NOTE: Check harness after checking intermediate connector B-14. If intermediate connector is damaged repair or replace it. Refer to Harness Connector Inspection. The confirm that the malfunction symptom is eliminated.
Q: Is the harness wire in good condition?
YES: Replace the ECM. Then confirm that the malfunction symptom is eliminated.
NO: Repair it. Then confirm that the malfunction symptom is eliminated.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.