Powertrain Controls - ECM/PCM

DTC 36 Chart:

Idle Speed Control Actuator Circuit:

CIRCUIT DESCRIPTION:
The control module grounds CKT 534 when Engine Coolant Temperature (ECT) is within range to enable the solenoid, allowing vacuum to retract the idle speed control actuator and lower the idle to controlled idle specification

DTC 36 WILL SET WHEN:
ECT is above 55° C (132° F), Vehicle Speed Sensor (VSS) is present, above 10 mph and Throttle Position (TP) angle is above 10%. The DTC will set on the keycycle after the fault has occurred.

ACTION TAKEN (PCM WILL DEFAULT TO):
None. (Warm idle speed will be higher than normal when idle speed control actuator system is inop.)

DTC 36 WILL CLEAR WHEN:
Conditions for fault are no longer present and TECH 1 scan tool "clear DTCs" function is used or 50 ignition switch keycycles have passed with no further faults or ignition switch is turned "OFF" and ECM "B" fuse is removed for 10 seconds.

DTC CHART TEST DESCRIPTION:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks to see if a vacuum source is present.
2. Checks to see if idle speed control actuator solenoid is commanded "ON."
3. Checks for power to the solenoid, the ground circuit, the connections at the idle speed control actuator solenoid and the solenoid itself.
4. Checks for open or grounded CKT 439.
5. Checks for open CKT 543 or faulty control module.

DIAGNOSTIC AIDS:
If BARO is below 68 kPa, a 96 second reset will result.
If DTC 36 sets, a DTC 35 will usually also set. Repair the DTC 36 first, clear DTCs and recheck for DTCs.
If IAC counts are at 0, the idle speed control actuator will disengage and raise idle speed.