Pinpoint Test U: The Grade Assist Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test U: The Grade Assist Indicator Is Never/Always On (Non-Hybrid)

Normal Operation

The Instrument Cluster (IC) receives the grade assist signal from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus. When the grade assist function is selected, the PCM sends a message to the IC to illuminate the grade assist indicator. If the message is missing or if the data is deemed invalid by the IC for more than 5 seconds, the IC sets DTC U0100 in continuous memory and defaults the grade assist indicator off.

NOTE: If DTC U0100 is set in the IC, other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- Transaxle concern
- PCM
- IC


PINPOINT TEST U: THE GRADE ASSIST INDICATOR IS NEVER/ALWAYS ON (NON-HYBRID)

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U1 CHECK THE OPERATION OF THE GRADE ASSIST FUNCTION

- Verify that the grade assist function turns on and off by pressing the grade assist button on and off while driving the vehicle.
- Does the grade assist function operate correctly?

Yes
GO to U2.

No
REFER to Automatic Transaxle/Transmission External Controls - 6F35 Testing and Inspection.

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U2 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC grade assist indicator (OVERDRV) active command. Command the O/D cancel/grade assist indicator on and off while observing the O/D cancel/grade assist indicator.
- Does the O/D cancel/grade assist indicator illuminate when commanded on and turn off when commanded off?

Yes
GO to U3.

No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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U3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST

- Check for recorded IC DTCs from the self-test.
- Are any DTCs recorded?

Yes
For DTC U0100, GO to Pinpoint Test AV. Pinpoint Tests AV: DTC U0100

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
GO to U4.

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U4 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST

- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any PCM DTCs recorded?

Yes
REFER to Computers and Control Systems Information.

No
INSTALL a new PCM. REFER to Electronic Engine Controls - Service and Repair. TEST the system for normal operation.

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