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Pinpoint Test E: DTC P065B




Pinpoint Test






Pinpoint Tests

Pinpoint Test E: DTC P065B

Refer to Wiring Diagram Set 12, Charging System for schematic and connector information. Diagrams By Number

Normal Operation

The PCM monitors the generator output via the GENMON circuit. The signal that is monitored by the PCM on the GENMON circuit is a controlled frequency range. If the signal is outside of this prescribed range, the PCM will be unable to read the signal. When the engine rises above approximately 2,000 rpm, the generator will default to a steady voltage of approximately 13.5 volts and the PCM will send a request to the Instrument Cluster (IC) to illuminate the charging system warning indicator lamp.

- DTC P065B (Generator Control Circuit Range/Performance) - If the input frequency was continuously less than 80 Hz or more than 200 Hz the PCM will set this DTC.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Generator
- PCM



PINPOINT TEST E: DTC P065B

NOTE: Make sure battery voltage is greater than 12.2 volts prior to carrying out this pinpoint test.

NOTE: Do not have a battery charger attached during vehicle testing.

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E1 CHECK THE BATTERY CONDITION


- Carry out the Battery - Condition Test to determine if the battery can hold a charge and is OK for use. Refer to Battery. Pinpoint Tests
- Does the battery pass the condition test?

Yes
GO to E2.

No
INSTALL a new battery. REFER to Battery. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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E2 CHECK THE PCM GENERATOR MONITOR FREQUENCY (GENMON_HZ) PID


- Start the engine.
- NOTE: Many of the PCM PIDs selected will be monitored later in this pinpoint test.
- Select and monitor the following PCM PIDs:
- Generator Voltage Desired (GENVDSD).
- Generator Monitor Frequency (GENMON_HZ).
- Monitor the GENMON_HZ PID.
- Is the PID below 80 Hz or above 200 Hz?

Yes
GO to E3.

No
The fault is not present at this time. This may indicate an intermittent fault. CARRY OUT a wiggle test on the charging system circuits to try and RECREATE the concern. CHECK generator connections for corrosion, loose connections and/or bent terminals. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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E3 CHECK THE PCM GENERATOR MONITOR FREQUENCY (GENMON_HZ) PID WITH GENERATOR C102A (gAS) OR C1104A (dIESEL) DISCONNECTED


- Ignition OFF.
- Disconnect: Generator C102A (gas) or C1104A (diesel).
- Start the engine.
- Monitor the GENMON_HZ PID.
- Does the PID read between 0-2 Hz?

Yes
GO to E5.

No
GO to E4.

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E4 CHECK GENERATOR CIRCUITRY


- Ignition OFF.
- NOTICE: Care must be taken when back probing the connector to prevent damage to the weather pack insulator.
- With the PCM connected, connect a fused jumper wire between PCM C175E-24, circuit CDC15 (VT) (gas) or C1232E-16, circuit CDC15 (VT) (diesel) and ground by carefully back probing the PCM.
- Start the engine.
- Monitor the GENMON_HZ PID.
- Does the PID read 0 Hz?

Yes
INSPECT the harness for wire-to-wire shorts or insulation chaffing, mis-pinned connectors and correct wire colors and REPAIR generator circuit CDC15 (VT) as needed. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
INSTALL a new PCM. REFER to Computers and Control Systems for gasoline and Computers and Control Systems for diesel. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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E5 MONITOR THE PCM PID GENERATOR MONITOR FREQUENCY (GENMON_HZ) WHILE ACTIVATING THE GENERATOR VOLTAGE DESIRED (GENVDSD) PID


- Ignition OFF.
- Connect a fused jumper wire between generator C102A-1, circuit CDC15 (VT) (gas) or C1104A-1, circuit CDC15 (VT) (diesel), harness side and generator C102A-2, circuit CDC10 (BU/OG) (gas) or C1104A-2, circuit CDC10 (BU/OG) (diesel), harness side.




- Start the engine.
- With the engine at idle, set the output state control GENVDSD PID to 14 volts.
- Monitor the GENMON_HZ PID.
- Does the GENMON_HZ PID read between 120-130 Hz?

Yes
INSTALL a new generator. REFER to Generator - Gasoline Engines , Generator - 6.4L Diesel, Single Generator Generator - Single Generator or Generator - 6.4L Diesel, Dual Generator Generator - Dual Generator. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

No
INSTALL a new PCM. REFER to Computers and Control Systems for gasoline and Computers and Control Systems for diesel. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

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