PCM Engine Control

DIAGNOSTIC TROUBLE CODES cause the SERVICE ENGINE SOON telltale lamp to illuminate.

11 Transmission Diagnostic Codes Present
12 Diagnostic Check Only (Flash Code)
13 Oxygen Sensor Circuit - Open/Not Ready
14 Engine Coolant Temperature Circuit - Temperature Out of Range High
15 ECT Circuit - Temperature Out of Range Low
17 PCM Fault - Pull-Up Resistor
19 (1991 Perf (LLO), 1992-1994 Vehicles) 6X Signal Fault
21 TP Sensor Circuit - Voltage Out of Range High
22 TP sensor Circuit - Voltage Out of Range Low
23 IAT Circuit - Temperature Out of Range Low
24 VSS Circuit - No Signal
25 IAT Circuit - Temperature Out of Range High
26 Quad Driver Output Fault
32 EGR System Fault
32 (NB6 Emission Vehicles) Linear Exhaust Gas Recirculation (EGR) System
33 Map Circuit - Voltage Out of Range High
34 Map Circuit - Voltage Out of Range Low
35 Idle Air Control (IAC) - RPM Out of Range
41 Ignition Control (IC) Circuit - Open or Shorted
42 Bypass Circuit - Open or Shorted
41 and 42 IC Control Circuit Grounded/Bypass Open
43 Knock Sensor Circuit (KS) - Open or Shorted
44 Lean Oxygen Sensor Signal
45 Rich Oxygen Sensor Signal
46 (1991 Base (LKO) Vehicles) Power Steering Pressure Circuit - Open
49 RPM - High Idle (Vacuum Leak)
51 PCM Memory Error
55 A/D Error
81 (1993-1994 Vehicles) ABS Message Fault
82 PCM - Internal Communication Fault



ENGINE INFORMATION FLAGS
16 Electronic Variable Orifice (EVO) Fault
27 (1993-1994 Vehicles) Quick Quad Driver Output Fault
48 Reference Input - Intermittent or Noisy
52 Battery Voltage Out of Range
53 Knock Sensor Circuit - Knock Present
54 Five Volt Reference Grounded
58 Battery Voltage Unstable
61 (1991 Base (LKO) Vehicles) 6X Signal Fault
63 Option Check Sum Error
67 (1991-1992 Vehicles) Handwheel Sensor Circuit Fault
71 Engine Cooling System - Temperature High
72 Engine Cooling System - Temperature Low
73 ECT Unstable
74 ECT/Trans Temp Sensor Ratio Error
75 IAT Unstable
76 TP Sensor Voltage vs Map Voltage - Out of Range
83 (1993-1994 Vehicles) Low Coolant Flag
84 (1993-1994 Vehicles) PCM - Internal Communication Failure