Charging system

Tiny
TNCARDOC
  • MEMBER
  • 2005 CHRYSLER PT CRUISER
2005 PT cruiser, PCM codes P0685, P0688, P0562. Need help with diagnostics please
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Tuesday, December 21st, 2010 AT 9:40 PM

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Tiny
BLUELIGHTNIN6
  • EXPERT
P0685 CHRYSLER - Auto Shutdown Relay Control Circuit Failure

Short or open in Auto Shutdown (ASD) relay circuit
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
- ASD relay circuit is open or shorted
- Failed Auto Shutdown relay
- Failed ECM
Tech Notes
Check all the ECM fuses, if the fuses are OK try replacing the ASD relay.

P0688 CHRYSLER - Auto Shutdown Relay Control Circuit Low

The Front Control Module (FCM) has detected the supply voltage below an acceptable value
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
- ASD relay circuit is open or shorted
- Failed Auto Shutdown relay
- Failed ECM
Tech Notes
Check all the ECM fuses, if the fuses are OK try replacing the ASD relay.

DIAGNOSTIC TROUBLE CODE (DTC) - P0562 SYSTEM VOLTAGE (ENGINE SIDE) TOO LOW

Know your Circuit

* The ignition voltage on the ignition feed circuit to terminal 7 at the ECM is controlled by the engine control module (ECM).
* If there is a voltage fluctuation and the voltage dips below the calibrated level, a system voltage Diagnostic Trouble Code (DTC) will automatically set

Pre-requisites for setting the DTC

The following conditions must prevail:

Ignition has to be ON.

Main relay is ON.

The ignition voltage is < 11.5 volt.

The main relay voltage is < 5.0V or > 26V for 7.6 seconds.

What happens when DTC sets?

When will DTC clear?

1) The Malfunction Indicator Lamp (MIL) will cease to glow.

1) A history DTC will clear after 40 consecutive warm-up cycles without a fault.

2) The ECM will record and store conditions present when the DTC was set as Failure Records data only

2) DTC(s) can be cleared by means of the scan tool.

3) This information will not be stored in the Freeze Frame data.

-

Diagnostic Tools

An Intermittent problem may be caused by the following:

1. A poor connection
2. Rubbed through wire insulation
3. Wire that is tampered inside the insulation.

Any circuitry suspected to cause the problem should be thoroughly checked for the following conditions.

Backed-out terminals

Improper mating

Broken locks

Improperly formed or tampered terminals

Poor terminals to wire connection

Physical damage to the wiring harness
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Tuesday, February 22nd, 2011 AT 12:58 AM

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