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PostitusPostitatud: 04 Aug 2006, 10:30 
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Liitunud: 01 Nov 2005, 21:11
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TROUBLE CODE DIAGNOSIS

The following abbreviations will be used in this section:

TPS - Throttle Position Sensor
ECM - Electronic Control Module
ISC - Idle Speed Control
HEI - High Energy Ignition
MAP - Manifold Absolute Pressure (Sensor)
BARO - Barometric Pressure (Sensor)
ECC - Electronic Climate Control
MAT - Manifold Air Temperature (Sensor)
CTS - Coolant Temperature Sensor
MPG - Miles Per Gallon (Display Panel)
EGR - Exhaust Gas Recirculation
MD - Modulated Displacement
MDA - Modulated Displacement Amplifier

The dash mounted "CHECK ENGINE" light is used to inform the technician of detected system malfunctions or abnormalities. The light goes out automatically of the fault clears (intermittent). However, the ECM stores the trouble code associated with the detected failure until the diagnostic system, is "Cleared" or until 20 ignition switch (on-off) cycles have occurred without the fault reappearing.

Proper operation of the light is as follows:

1. The light is normally off.
2. A bulb check is preformed when the ignition is in the "On" and "Crank" positions. When the engine starts, the bulb goes out.
3. The light comes on and stays on when a constant malfunction is detected.
4. If a malfunction is intermittent, the light will go out when the malfunction is not present. The light will come on each time a malfunction is detected (may flicker).
5. The light stays on when the system is displaying the diagnostic routine.

The dash mounted digital display panel, normally used for the ECC system, can be temporarily directed to display trouble codes stored in the ECM.



HOW TO "ENTER" DIAGNOSTIC MODE

To enter diagnostic mode, proceed as follows:

1. Turn the ignition "ON".
2. Depress the "OFF" and "WARMER" buttons on the ECC panel simultaneously and hold until "--" appears. "88" will then be displayed which indicated the beginning of the diagnostic readout.
3. Trouble codes will be displayed on the digital ECC panel beginning with the lowest numbered code. Note that the MPG panel goes blank when the system is displaying as the diagnostic mode.



HOW TO "CLEAR" TROUBLE CODES

Trouble codes stored in the ECM's memory may be cleared (erased) by entering the diagnostic mode and then depressing the "OFF" and "HI" button simultaneously. Hold until "00" appears. After "00" is displayed the ECM will display "70". Turn the ignition off for at least 10-seconds before re-entering the diagnostic mode.



HOW TO "EXIT" DIAGNOSTIC MODE

To get out of the diagnostic mode, depress any of the ECC "function" keys (Auto, Econ, etc. except Rear Defog) or turn ignition switch off for 10 seconds. Trouble codes are not erased when this is done. The temperature setting will reappear in the display panel.



DIAGNOSIS PROCEDURE

When the check engine light turns on, it indicated that a malfunction has occurred for which a trouble code has been stored. The trouble code can be displayed on the ECC control panel. The malfunction may or may not result in abnormal engine operation.

To determine which system(s) has malfunctioned, proceed as follows:

1. Turn the ignition "ON" for 5 seconds.
2. Depress the "OFF" and "WARMER" buttons on the Electronic Climate Control panel simultaneously and hold until "--" appears.
3. The numerals "88" should then appear. The purpose of "88" is to check that all segments of the display are working. Diagnosis should not be attempted unless the entire "88" appears as this could lead to misdiagnosis (Code 31 could be Code 34 with two segments of the display inoperative, etc.).
4. If trouble codes are present, they will be displayed on the digital ECC panel as follows:
1. The lowest numbered code will be displayed for approximately two seconds.
2. Progressively higher numbered codes, if present will be displayed consecutively for two seconds intervals until the highest code present has been displayed.
3. "88" is again displayed.
4. Parts a b and C above will be repeated a second time.
5. when the trouble codes have been displayed, code 70 will then be displayed. Code 70 indicates that the ECM id ready for the next diagnostic feature to be selected.
5. If no trouble codes are present, "88" will be displayed for a longer period of time, and then the ECM will display code 70. Code 70 indicates that the ECM is ready for the next diagnostic feature to be selected.


1980's Diagnostic Codes
The following codes are programmed
into the ECM

Code Circuit Affected
00 (E00) No PCM systems faults
12 (E12) No TACH Signal
13 (E13) O2 Sensor Not Ready
14 (E14) Shorted Coolant Sensor
15 (E15) Open Coolant Sensor
16 (E16) Generator Voltage Out Of Range
17 (E17) Crank Signal Circuit High
18 (E18) Open Crank Signal Circuit
19 (E19) Fuel Pump Circuit High
20 (E20) Open Fuel Pump Circuit
21 (E21) Shorted Throttle Position Sensor Circuit (DFI)
Wide Open Throttle (WOT) Position Sensor Circuit (all others)
22 (E22) Open Throttle Position Sensor Circuit
23 (E23) EST/Bypass Circuit Shorted or Open (DFI)
Mixture Control (M/C) Solenoid Open (Carbureted)
MAT Sensor Circuit - Low Temp (TBI/all others)
24 (E24) Vehicle Speed Sensor (VSS) Failure
25 (E25) Modulated Displacement Failure (v8-6-4)
EST/Bypass Circuit Shorted or Open (HT4100)
MAT Sensor Circuit - High Temp (TBI/all others)
26 (E26) Shorted Throttle Switch Circuit
27 (E27) Open Throttle Switch Circuit
28 (E28) Open Fourth Gear Circuit
29 (E29) Shorted Fourth Gear Circuit
30 (E30) Idle Speed Control Circuit
31 (E31) Shorted MAP Sensor Circuit (DFI)
Canister Purge Problem (all others)
32 (E32) Open MAP Sensor Circuit (DFI/TBI)
BARO Sensor Circuit Problem (Carbureted)
33 (E33) MAP/BARO Sensor Correlation (DFI)
Shorted MAP Sensor Circuit (all others)
34 (E34) Vacuum Sensor/MAP Hose (DFI)
Open MAP Sensor Circuit (all others)
35 (E35) Shorted BARO Sensor Circuit (DFI)
Idle Speed Control Circuit Shorted (all others)
36 (E36) Open BARO Sensor Circuit
37 (E37) Shorted MAT Sensor Circuit
38 (E38) Open MAT Sensor Circuit
39 (E39) TCC Engagement Problem
41 (E41) Electronic Spark Timing (EST) Problem
42 (E42) Electronic Spark Timing (EST) Circuit Open
43 (E43) Electronic Spark Control (ESC) Problem
44 (E44) O2 Sensor Lean
45 (E45) O2 Sensor Rich
51 (E51) PROM Insertion Fault
52 (E52) ECM Memory Reset Indicator
53 (E53) Distributor Signal Interrupt (HT4100)
ECM Unit Fault (V6 Models)
EGR Valve Vacuum Problem (all others)
54 (E54) Mixture Control (M/C) Solenoid Shorted
55 (E55) ECM/Oxygen Sensor Fault
60 (E60) Drive (ADL) Switch Circuit
61 (E61) Set and Resume Switch Circuit
62 (E62) Car Speed Exceeds Maximum Limit
63 (E63) Car and Set Speed Tolerance Exceeded
64 (E64) Car Acceleration Exceeds Maximum Limit
65 (E65) Coolant Temperature Exceeds Maximum Limit
66 (E66) Engine RPM Exceeds Maximum Limit
67 (E67) Shorted Set Or Resume Circuit
70 System Ready - Switch Tests
71 Brake Light Switch
72 ISC Throttle Switch
73 Drive (ADL) Switch
74 Back-Up Lamp Switch
75 Cruise On/Off Circuit
76 Set/Coast Circuit
77 Resume/Acceleration Circuit
78 Instant/Average MPG Button
79 Reset MPG Button
80 A/C Clutch Circuit
88 Display Check (-.1.8.8)
90 System Ready To Display Engine Data
95 System Ready for Acuator Cycling
96 Actuator Cycling
97 MD Cylinder Solenoid Cycling
00 All Diagnostic Complete


1980's Diagnostic Codes
The following codes are programmed
into the BCM

Code Circuit Affected
F00 No BCM System Faults
F10 Outside Air Temperature Circuit Problem
F11 A/C High Side Temperature Circuit Problem
F12 A/C Low Side Temperature Circuit Problem
F13 In-Car Temperature Circuit Problem
F19 Blower motor failure
F32 BCM to ECM date transfer problem
F40 Air Mix Door Problem
F41 Cooling Fans Problem
F46 Low A/C Refrigerant Condition Warning (1/2 charge)
F47 Very Low A/C Refrigerant Condition Warning (1/4 charge)
F48 Very Low A/C Refrigerant Pressure Condition
F49 A/C High Side Temperature Too High (temperature exceeds 200°F)
F50 Coolant Temperature Too High (exceeds 259°F)



Engine Data Display Procedure

Code "70" must be displayed on the ECC panel before engine data can begin. To display engine data slide the cruise control instrument panel switch from the ON position to the OFF position (1982 model year cars push "RESET" button the on the MPG display) the display code will advance from "70" to "90". To display the next parameter depress the "INSTANT/AVERAGE" button on the MPG panel. When the last parameter/data is reach the display will change to "95."

Engine Data Display

Parameter No. Parameter Value Units
01 TPS (Throttle Angle) XX Degrees
02 MAP (Manifold Air Pressure) XX kPa (KiloPascals)
03 BARO (Barometric Air Pressure) XX kPa (KiloPascals)
04 Coolant Temperature XX 0=-40C 99=150C (Degrees Celsius)
05 MAT (Manifold Air Temperature XX 0=-40C 99=150C (Degrees Celsius)
06 Injector Pulse Width X.X MSec (Milliseconds)
07 O2 Sensor .XX Volts
08 Spark Advance XX Degrees
09 Ignition Cycles XX Key Cycles
10 Open/Closed-Loop Indicator X 0=Open Loop 1=Closed Loop (HT4100 battery voltage)
11 Battery Voltage X.X Volts - Will Not Display 10's Digit (HT4100 engine RPMs)
12 Vehicle Speed (HT4100)
13 Prom ID (HT4100)

On cars equiped with an "outside temperature" button on the ECC, ECM operating mode can be switched between closed loop vs. open loop mode by depressing this button. With the LED illuminated ECM operates in a "Closed Loop Mode" - with the LED off ECM is in "Open Loop Mode."

ECM O2 Throttlet TCC output 4th A/C
operating sensor switch input output gear input clutch
mode input input input output
----------------------------------------------------------------------------------------------
Light on Closed loop Rich Closed throttle TCC enabled In 4th gear A/C Clutch enabled
Light off Open loop Lean Open throttle TCC disabled Not in 4th gear A/C Clutch disabled


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