Pinpoint Tests AK: The Ready To Drive Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Test AK: The Ready To Drive Indicator Is Never/Always On (Hybrid)

Normal Operation

The purpose of the ready to drive indicator is to inform the driver that the hybrid electric drivetrain is ready to operate. Since the engine can start and stop at different times while the vehicle is driven and operated in the electric vehicle mode, the ready to drive indicator is used so that the customer doesn't interpret the engine turning off as a stalled condition. The Instrument Panel Cluster (IPC) receives the electric vehicle ready to drive on/off command from the PCM over the High Speed Controller Area Network (HS-CAN) communication bus.

If the electric vehicle ready to drive on/off command is missing for less than 5 seconds, the ready to drive indicator remains in the last indication mode (on or off) based upon the last known good message received. If the electric vehicle ready to drive on/off command is missing for more than 5 seconds, the IPC sets DTC U0100:00 in continuous memory and defaults the ready to drive indicator off.

NOTE: If DTC U0100:00 is set in the IPC, other observable symptoms may be an inoperative speedometer, tachometer or odometer.

This pinpoint test is intended to diagnose the following:

- PCM
- IPC


PINPOINT TEST AK: THE READY TO DRIVE INDICATOR IS NEVER/ALWAYS ON (HYBRID ONLY)

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AK1 CARRY OUT THE READY TO DRIVE INDICATOR OPERATION

- Ignition ON.
- Monitor the ready to drive indicator.
- Place the ignition in the START position then allow the key to return to the ON position and monitor the ready to drive indicator.
- Does the ready to drive indicator remain off in the ON position and illuminate after moving to the START position?

Yes
The system is operating correctly at this time. The ready to drive indicator illuminates whenever the ignition is turned to the START position then returns to the RUN or ON position.

No
GO to AK2.

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AK2 CARRY OUT THE IPC DEALER TEST MODE

- Ignition ON.
- Enter the IPC dealer test mode.
- Scroll through the displays to display TELLTALE TEST and monitor the ready to drive indicator.
- Does the ready to drive indicator illuminate when in the dealer test mode and turn off when in normal operation mode?

Yes
GO to AK3.

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

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AK3 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
GO to AK4.

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AK4 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST

- Check for recorded IPC DTCs from the self-test.
- Is DTC U0100:00 recorded?

Yes
GO to Pinpoint Test BF. Pinpoint Tests BF: DTC U0100:00

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

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