4.3L TBI Tests W/Codes

Model Identification
Description
Diagnostic System Operation
- Notes
- "Hard Failures"
- "Intermittent Failures"
Basic Diagnostic Procedure
Entering Or Exiting Diagnostic Mode (Non-Scan)
Reading Trouble Codes
ECM Trouble Code Definitions
Trouble Code Determination (Hard Or Intermittent)
Clearing Trouble Codes
Diagnostic Materials
- Notes
- Diagnostic Charts
- Diagnostic Aids
- Field Service Mode Check (Fuel Injected Models)
Special Diagnostic Tools
Scan Tester Usage
Scan Tester - Test Data Parameters
"Non-Scan" Diagnostic Circuit Check
"Scan" Data Diagnostic Circuit Check
Chart A1 - No "Service Engine Soon" Light
- Notes
- Diagnostic Aids
  - Engine Runs Okay, Check The Following:
  - Cranks, But Will Not Run, Check The Following:
Chart A2 - No Code 12, "SES" Light On Steady
- Won't Flash Code 12 "Service Engine Soon" ("SES") Light On Steady
Chart A3 - Engine Cranks But Won't Run
- Chart A3 (1 Of 2) - Engine Cranks But Won't Run
  - Notes
  - Diagnostic Aids
- Chart A3 (2 Of 2) - Engine Cranks But Won't Run
Chart A7 - Fuel System Diagnosis
- Chart A7 (1 Of 2) - Fuel System Diagnosis
  - Notes
  - Diagnostic Aids
- Chart A7 (2 Of 2) - Fuel System Diagnosis
Code 13 - Open Oxygen (O2) Sensor Circuit
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 14 - Coolant Sensor (Temperature Too High)
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 15 - Coolant Sensor (Temperature Too Low)
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 21 - TPS Signal Voltage High
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 22 - TPS Signal Voltage Low
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 23 - Mat Sensor Temperature Low
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 24 - Vehicle Speed Sensor ("B" & "G" Bodies)
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 24 - Vehicle Speed Sensor ("F" Body)
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 25 - Mat Sensor Temperature High
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 32 - EGR System Failure (1987 Models)
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 32 - EGR System Failure (1988 Models)
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 33 - Map Sensor Signal Voltage High
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 34 - Map Sensor Signal Voltage Low (High Vacuum)
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 42 - Electronic Spark Timing (Est)
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 43 - Electronic Spark Control (ESC)
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 44 - Lean Exhaust Indication
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 45 - Rich Exhaust Indication
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 51 - Faulty Prom
Code 52 - Fuel "CALPAK" Missing
Code 54 - Fuel Pump Circuit Low Voltage
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Code 55 - Faulty ECM
Chart B1 - Restricted Exhaust System Checks
- Restricted Exhaust Check 1 (All With Air Or PULSAIR)
- Restricted Exhaust Check 2 (All Without Air Or PULSAIR)
Chart C1 - ECM Replacement Check Chart
Chart C1A - Park/Neutral Switch Diagnosis (Auto Trans.)
Chart C1B - Crank Signal
Chart C1D - Map Output Check
Chart C2C - Idle Air Control
- Notes
- 4.3L TBI Tests W/Codes
  - Diagnostic Aids
Chart C3 - Canister Purge Check
Chart C4B - Ignition System Check
Chart C5 - Electronic Spark Control (ESC) Check
Chart C6B - Air Management Check (PEDES Valve)
Chart C7 - EGR Check
Chart C8A - 200-4R Torque Converter Clutch Diagnosis
- 200-4R Torque Converter Clutch (TCC) Diagnosis (1 Of 2)
  - Notes
  - Diagnostic Aids
- 200-4R Torque Converter Clutch (TCC) Diagnosis (2 Of 2)
  - Notes
  - Diagnostic Aids
Component Locations
ECM Terminal Identification
Wiring Diagrams