Chrysler 300M 2002 Service Manual page 2672

P0594-SPEED CONTROL SERVO POWER CIRCUIT —
TEST
2 NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
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.
With the engine running at normal operating temperature, monitor the DRBIII
parameters related to the DTC while wiggling the wire harness. Look for parameter
values to change and/or a DTC to set.
Review the DRBIII Freeze Frame information. 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 wire harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect the related wire harness connectors. Look for broken, bent, pushed
out, or corroded terminals.
Were any of the above conditions present?
Yes → Repair as necessary
→ Test Complete.
No
3 Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the Brake Lamp Switch harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the Speed Control Source circuit from the Brake Lamp
Switch harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes → Go To 4
→ Repair the open/high resistance in the Speed Control Source
No
4 Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the Brake Switch harness connector.
Measure the resistance between ground and the Speed Control Source circuit in the
Brake Switch harness connector.
Is the resistance below 100 ohms?
Yes → Go To 5
→ Repair the short to ground in the S/C Source circuit.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 4.
circuit between the PCM and Brake Switch.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
Perform POWERTRAIN VERIFICATION TEST VER - 4.
DRIVEABILITY - NGC
243
Continued
APPLICABILITY
All
All
All