Refer to
IAC Valve, Generator, TR, Oil, and Coolant Switches
Diagnostic Aids
For diagnosis of the instrument panel, perform the System Check in the Instrument Panel Cluster section of Electrical Diagnosi s.
Check for the following conditions:
| • | Poor connection at PCM or Coolant Level Indicator. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. |
| • | Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM and turn the ignition ON. Observe a voltmeter connected to the affected PCM circuit while moving connectors and wiring harnesses related to the PCM circuit. A change in voltage will indicate the location of the fault. |
Test Description
The numbers below refer to the step numbers on the Diagnostic Table:
-
Refer to IPC Microprocessor for further diagnostics. This diagnostic only covers inputs to the PCM.
-
This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed. Refer to PCM Replacement/Programming .
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 |
Important: : Ensure that Engine Coolant Level is not low, refer to Engine Cooling System before continuing diagnosis. Was the A Powertrain On Board Diagnostic (OBD) System Check performed? | -- | Go to A Powertrain On Board Diagnostic (OBD) System Check | |
2 |
Is the test light ON? | -- | ||
3 |
Does the DMM display voltage near the specified value? | B+ | ||
4 | Connect the DMM between the Engine Coolant Level Indicator signal circuit and chassis ground. Does the DMM display a voltage near the specified value? | B+ | ||
5 |
Was a problem found? | -- | ||
6 |
Was a problem found? | -- | ||
7 |
Was a problem found? | -- | ||
8 | Locate and repair open in the Engine Coolant Level Indicator ground circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
9 | Replace the Engine Coolant Level Indicator switch. Is the action complete? | -- | -- | |
Refer to Instrument Panel Cluster (IPC) Microprocessor for diagnosis. Was a problem found? | -- | |||
|
Important: : Important: Replacement PCM must be programmed. Refer to PCM Replacement/Programming . Replace the PCM. Is the action complete? | -- | -- | ||
12 | Check for proper operation of Indicator light(s). Refer to Instrument Cluster System Check in Insrument Panel, Gauges and Console. Is the correct operation indicated? | -- | System OK |
