Transfer Case - Getrag 790: Diagnosis GMC Acadia I

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(ref-365273-S03182733772010070600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-365273-S36821411302010070600000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-365273-S42262158172010070600000) provides an overview of each diagnostic category.

Diagnostic Fault Information

Conditions for Running the DTC

Ignition ON.

Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the rear differential clutch control module.
2. Ignition ON, verify a test lamp does not illuminate between the control circuit terminals listed below and ground: terminal 5 terminal 3 If the test lamp illuminates, test the appropriate control circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the control circuit terminals listed below and ground: terminal 5 terminal 3 If less than the specified value, test the appropriate control circuit for a short to ground.
4. Test for less than 5 ohms between the control circuit terminal 5 and control circuit terminal 3. If greater than the specified range, test both control circuits for an open/high resistance. If the circuits test normal, replace the differential clutch drum assembly.
5. If all circuits test normal, replace the rear differential clutch control module.

1. Perform the «Diagnostic System Check - Vehicle»(ref-365273-S03182733772010070600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-365273-S36821411302010070600000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-365273-S42262158172010070600000) provides an overview of each diagnostic category.

The ignition is ON.

Conditions for Setting the DTC

An open or short to ground is detected on the temperature sensor circuits.

Action Taken When the DTC Sets

One or more of the following actions may occur

1. All Wheel Drive Off (AWD Disabled), DIC message
2. Service All Wheel Drive (Service AWD), DIC message

Conditions for Clearing the DTC

1. The condition for the DTC is no longer present.
2. The DTC is not detected in 40 consecutive drive cycles.

1. Ignition OFF, disconnect the X1 harness connector at the rear differential clutch control module.
2. Ignition ON, verify a test lamp does not illuminate between the signal circuit terminal 2 and ground: If the test lamp illuminates, test the signal circuit for a short to voltage.
3. Ignition OFF, test for infinite resistance between the signal circuit terminal 2 and ground: If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the clutch assembly.
4. Test for 310-113K ohms between the signal circuit terminal 2 and the low reference circuit terminal 4. If less than the specified range, test both circuits for a short together. If the circuits test normal, replace the differential clutch drum assembly. If greater than the specified range, test both circuits for an open/high resistance. If the circuits test normal, replace the differential clutch drum assembly.
5. If all circuits test normal, replace the rear differential clutch control module.

1. Perform the «Diagnostic System Check - Vehicle»(ref-365273-S03182733772010070600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-365273-S36821411302010070600000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-365273-S42262158172010070600000) provides an overview of each diagnostic category.

The ignition switch is in the ON position.

An internal CCM malfunction exists.

One or more of the following actions may occur

1. All Wheel Drive Off (AWD Disabled), DIC message
2. Service All Wheel Drive (Service AWD), DIC message

1. The condition for the DTC is no longer present.
2. The DTC is not detected in 40 consecutive drive cycles.

1. Perform the «Diagnostic System Check - Vehicle»(ref-365273-S03182733772010070600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-365273-S36821411302010070600000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-365273-S42262158172010070600000) provides an overview of each diagnostic category.

Ignition voltage is greater than 9 volts.

The calibration data (matching ID) of the CCM is not programmed or incorrectly programmed.

One or more of the following actions may occur

1. All Wheel Drive Off (AWD Disabled), DIC message
2. Service All Wheel Drive (Service AWD), DIC message

1. The condition for the DTC is no longer present.
2. The DTC is not detected in 40 consecutive drive cycles.

1. Perform the «Diagnostic System Check - Vehicle»(ref-365273-S03182733772010070600000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-365273-S36821411302010070600000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-365273-S42262158172010070600000) provides an overview of each diagnostic category.

Ignition voltage is greater than 9.5 volts.

The CCM receives an invalid message from the ECM or EBCM, over serial data which causes the CCM to deactivate.

One or more of the following actions may occur

1. All Wheel Drive Off (AWD Disabled), DIC message.
2. Service All Wheel Drive (Service AWD), DIC message.

1. The condition for the DTC is no longer present.
2. The DTC is not detected in 40 consecutive drive cycles.

Diagnostic Aids

DTC C0561 is an indicator that the CCM receives an invalid message from the ECM or EBCM, and does not necessarily indicate a fault is present with the CCM. This DTC should not be used as a fault indicator, but rather as a symptom to assist in the diagnosis of these other systems.

Strategy Based Diagnostics

Review the system operations in order to familiarize yourself with the system functions. Refer to Transfer Case Disassembled View , Transfer Case Description and Operation , and Rear Drive Axle Description and Operation . All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform approach for repairing all systems. The diagnostic flow may always be used in order to resolve a system condition. The diagnostic flow is the place to start when repairs are necessary. For a detailed explanation, refer to Strategy Based Diagnosis .

Visual/Physical Inspection

1. Inspect for aftermarket devices, which could affect the operation of the vehicle. Refer to «Checking Aftermarket Accessories»(ref-365275-S25618774722010070600000) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions, which could cause the symptom.
3. Inspect for the correct lubricant levels and the proper viscosities.
4. Verify the exact operating conditions under which the concern exists. Note factors such as vehicle speed, road conditions, ambient temperature, and other specifics.
5. Compare the driving characteristics or sounds, if applicable, to a known good vehicle and ensure you are not trying to correct a normal condition.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «Diagnostic System Check - Vehicle»(ref-365273-S03182733772010070600000)
2. «Noisy in Drive»(ref-365299-S10800100992010070600000)
3. «Noisy When Coasting»(ref-365299-S35544307382010070600000)
4. «Intermittent Noise»(ref-365299-S32971863072010070600000)
5. «Constant Noise»(ref-365299-S01098819442010070600000)
6. «Transfer Case Leak Diagnosis»(ref-365299-S23394696072010070600000)

Transfer Case Leak Diagnosis