Engine Controls - DTC Code 36 Chart Revised

89pontiac07

Bulletin Number: 88-6-93
Reference Number: 916511
Publish Date: 4/89
Subject: SERVICE MANUAL UPDATE-SECTION 6E3- DRIVEABILITY AND EMISSIONS - REVISED CODE 36 CHART, FACING PAGE

Models
Affected: 1988 GRAND AM 2.3L (VIN D)
This bulletin serves to revise the Chart and Facing Page for Code 36 in Section 6E3 "Driveability And Emissions" in the 1988 Service Manual for Grand Am models with (VIN D) 2.3L engine.



CODE 36

CLOSED THROTTLE AIR FLOW TOO HIGH 2.3L (VIN D) "N" SERIES (PORT)
Circuit Description:
Code 36 is the result of a check intended to detect intake vacuum leaks and sets when:
^ Engine running
^ Calculated air flow greater than a calibrated value
^ TPS signal is less than 3% (about 120 mV above learned zero voltage)
^ IAC valve commanded position is 5 counts (steps) or less
^ Above conditions are met for 5 seconds or more






Diagnostic Aids:

Check for vacuum leaks, unconnected lines, brittle hoses, cuts, etc. Examine manifold and throttle body gaskets for proper seal. Check for cracked intake manifold. Check for normal operation of TPS and MAP, as compared to known good cars if necessary.
Check for open in IAC CKTs 441, 442, 443 and 444 or faulty connections at ECM terminals "YC3", "YC4", "YC5" and "YC6" or TAC terminals "A" and "C". An IAC valve which is stopped in an open position and can't respond to the ECM, or minimum air rate throttle stop screw set too high, can also cause Code
36. If no problem is found, and code re-sets, replace ECM.