DTC 35

Code 35 Chart:

Code 35 Wiring Diagram:

CIRCUIT DESCRIPTION:

The ECM controls idle speed to a calculated, "desired" rpm based on sensor inputs and actual engine rpm, determined by the time between successive 2X ignition reference pulses from the ignition module. The ECM uses 4 circuits to move an idle air control valve (IAC), which allows varying amounts of air flow into the the intake manifold, controlling idle speed.

Code 35 will set when:

^ Engine speed is at least 175 rpm more or less than "desired."
^ TPS voltage indicates throttle is open less than 1%.
^ VSS indicates vehicle speed is less than 3 mph.
^ All above conditions are continuously met for 5 or more.



NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.

DIAGNOSTIC AIDS:

^ Check for vacuum leaks, disconnected lines, brittle hoses, cuts, etc. Examine manifold and throttle body gaskets for proper seal. Check for cracked intake manifold.


^ Check for opens, shorts or poor connections to IAC valve in circuits 441, 442, 443, 444. This will result in improper idle control and may set a Code 35.

^ Also check for faulty connections at ECM terminals YE3, YE4, YE5 and YE6.

^ An IAC valve which is stopped and cannot respond to the ECM, a throttle stop screw which has been tampered with, or a damaged throttle body or linkage could cause Code 35. If no problem is found and Code 35 resets, replace ECM.