Chrysler PT Cruiser. Manual - part 159

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the ECM harness connectors.
Disconnect the Generator Field harness connector.
Measure the resistance of the Generator Field Control circuit.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 11

→ Repair the Generator Field Control circuit for an open.

Perform CHARGING VERIFICATION - VER-3.

Turn the ignition off.
Disconnect the generator harness connector.
Turn the ignition on.
Measure the voltage of the ASD Relay Output circuit.
Is the voltage above 10.0 volts?

All

Yes

→ Go To 12

→ Repair the ASD Relay Output circuit for an open.

Perform CHARGING VERIFICATION - VER-3.

Turn the ignition off.
Disconnect the ECM harness connectors.
Remove Fuse 13 from the PDC.
Measure the resistance of the Fused B+ circuit at ECM harness connector cavity
C1-19.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 13

→ Repair the Fused B+ circuit for high resistance.

Perform CHARGING VERIFICATION - VER-3.

Turn the ignition off.
Disconnect the ECM harness connectors.
Using a 12-volt test light connected to 12-volts, check the Ground circuit at ECM
harness connector cavity C1-20.
Does the test light illuminate brightly?

All

Yes

→ Replace and program the Engine Control Module in accordance

with the Service Information.
Perform CHARGING VERIFICATION - VER-3.

→ Repair the Ground circuit for high resistance.

Perform CHARGING VERIFICATION - VER-3.

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DRIVEABILITY - DIESEL

P0560-SYSTEM VOLTAGE TOO LOW —

Continued

TEST

ACTION

APPLICABILITY

WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wiring harness. Look for param-
eter values to change and/or a DTC to set.
Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the
conditions under which the DTC was set.
Refer to any Technical Service Bulletins (TSB) that may apply.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wiring harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?

All

Yes

→ Repair as necessary

Perform CHARGING VERIFICATION - VER-3.

→ Test Complete.

117

DRIVEABILITY - DIESEL

P0560-SYSTEM VOLTAGE TOO LOW —

Continued

Symptom:

P0579-S/C SWITCH SIGNAL CIRCUIT PLAUSIBILITY

When Monitored and Set Condition:

P0579-S/C SWITCH SIGNAL CIRCUIT PLAUSIBILITY

When Monitored:

With the ignition on.

Set Condition:

The ECM detects an invlalid voltage on the S/C Switch Signal circuit.

POSSIBLE CAUSES

SPEED CONTROL SWITCH

INTERMITTENT CONDITION

HIGH RESISTANCE IN THE S/C SWITCH SIGNAL CIRCUIT

HIGH RESISTANCE IN THE S/C SWITCH GROUND CIRCUIT

ENGINE CONTROL MODULE

TEST

ACTION

APPLICABILITY

NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRB, erase ECM DTCs.
Test drive the vehicle and activate the Speed Control.
At some point during the test drive, move the S/C Switch to each of its positions.
With the DRB, read ECM DTCs.
Did this DTC set again?

All

Yes

→ Go To 2

→ Go To 5

Turn the ignition off.
Disconnect the S/C Switch harness connectors.
Disconnect the ECM harness connectors.
Measure the resistance of the S/C Switch Signal circuit.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 3

→ Repair the S/C Switch Signal circuit for high resistance.

Perform SPEED CONTROL VERIFICATION - VER-4.

118

DRIVEABILITY - DIESEL

TEST

ACTION

APPLICABILITY

Turn the ignition off.
Disconnect the S/C Switch harness connectors.
Disconnect the ECM harness connectors.
Measure the resistance of the S/C Switch Ground circuit.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 4

→ Repair the S/C Switch Ground circuit for high resistance.

Perform SPEED CONTROL VERIFICATION - VER-4.

Start the engine.
With the DRBIII

t, read the S/C SWITCH VOLTS.

Observe the S/C Switch volts on the DRBIII

t while pressing and holding the S/C

Switch lever in each position separately.
NOTE: Pressing the cruise lever to each of its positions should result in the
following voltages: ON/OFF 0.60 - 1.15v, COAST/SET 3.17 - 3.57v, ACC/RES
3.89 - 4.19v, CANCEL 1.60 - 2.00v, Switch lever at rest 4.33 - 4.80v.
Does each switch position produce the correct voltage?

All

Yes

→ Replace and program the Engine Control Module in accordance

with the Service Information.
Perform SPEED CONTROL VERIFICATION - VER-4.

→ Replace the S/C Switch.

Perform SPEED CONTROL VERIFICATION - VER-4.

All

Yes

→ Repair as necessary.

Perform SPEED CONTROL VERIFICATION - VER-4.

→ Test Complete.

119

DRIVEABILITY - DIESEL

P0579-S/C SWITCH SIGNAL CIRCUIT PLAUSIBILITY —

Continued

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