Part 3 of 3

Code 32 Chart - Part 3 Of 3.:

Linear EGR Wiring.:

TEST DESCRIPTION

1. This diagnostic chart assumes that DTC 26 and 32 were related, therefore, it is important that other QDM functions are operating properly before diagnosing potential EGR problem. If there is a QDM problem data in the general information table will indicate if the problem is in QDM-A or QDM-B.


2. When the engine is at idle EGR is commanded Off. During this condition the linear EGR module should be supplying 12 volts to the PCM pin J2A05. If DTC 26 and 27 are set, the problem is due to a low voltage being detected on circuit 697.

3. A blown EGR fuse would result in a DTC 26 due to the low voltage on circuit 697.

DIAGNOSTIC AIDS

When attempting to diagnose an intermittent problem use the Scan tool and review the MALF history supplemental code information. The supplemental data may help indicate when the problem occurred.


If MALF history indicates DTC 26 and 32 were set and no other quad driver related complaints were detected. the DTC 32 was probably set due to a problem in circuit 697. the linear EGR module or possibly the PCM.

When the fuel trim/oxygen sensor portion (part A) of the diagnostics is performed the EGR valve is commanded off and the actual pintle position will go to 0% and desired will read some % value. If this test fails three times and DTC 32 sets the actual position will read 0%. However, the desired position may indicate some other value. This is due to desired position, is always being calculated by the PCM even if the valve is not actually commanded on.


If DTC 32B is detected, check the desired and actual pintle position. If both of these parameters have a percent open value in them, but they do not closely match each other, the sensor may be sticking in a certain position.


^ If DTC 32A continues to set inspect EGR pintle for carbon build-up.

^ Make sure EGR valve gasket and EGR valve are installed correctly or a vacuum leak will occur.