Home/Chevrolet/Cutaway P30/Chevrolet Cutaway P30 (1988-1999)/Repair manual/Engine Controls - Tests W/codes - v6/CODE 39, TCC CIRCUIT - 3.8L

Contents

Section: Engine Controls - Tests W/codes - v6

INTRODUCTION

TERMINOLOGY

SELF-DIAGNOSTIC SYSTEM

HARD FAILURES

INTERMITTENT FAILURES

DIAGNOSTIC PROCEDURE

RETRIEVING CODES (NON-SCAN)

READING TROUBLE CODES

HARD OR INTERMITTENT TROUBLE CODE DETERMINATION

CLEARING TROUBLE CODES

ECM LOCATION

Diagnostic Aids

Field Service Mode Check

SPECIAL TOOLS (DIAGNOSTIC)

SCAN TESTER USAGE

SCAN TESTER DATA

SUMMARY

SELF-DIAGNOSTIC TESTS

CODE 13, OPEN OXYGEN SENSOR CIRCUIT

CODE 14, COOLANT SENSOR SIGNAL VOLTAGE LOW

CODE 15, COOLANT SENSOR SIGNAL VOLTAGE HIGH

CODE 16, SYSTEM VOLTAGE HIGH/LOW 3.8L

CODE 16, TRANSMISSION OUTPUT SPEED 4.3L "S" & "T" SERIES UTILITY VEHICLES WITH M/T & 4.3L WITH 4L60E TRANSMISSION

CODE 17, RPM SIGNAL PROBLEM 3.8L

CODE 18, CAM/CRANK ERROR 3.8L

CODE 21, TPS SIGNAL VOLTAGE HIGH

CODE 22, TPS SIGNAL VOLTAGE LOW

CODE 23, MAT SENSOR TEMP. LOW - 3.8L & 4.3L CPI

CODE 23, MAT SENSOR TEMP. LOW - 4.3L TURBO

CODE 24, VEHICLE SPEED SENSOR - 4.3L TURBO & 4.3L ("C", "K" & "P" SERIES) WITH MANUAL TRANSMISSION

CODE 24, VEHICLE SPEED SENSOR (VSS) 3.1L

CODE 24, VEHICLE SPEED SENSOR (VSS) 3.8L

CODE 24, VEHICLE SPEED SENSOR 4.3L "S" & "T" SERIES PICKUP WITH MAN. TRANS. (EXCEPT TURBO) & ALL 4WD WITH 4L80-E TRANSMISSION

CODE 24, VEHICLE SPEED SENSOR 4.3L "S" & "T" SERIES UTILITY VEHICLES WITH MANUAL TRANSMISSION, 4.3L, 5.0L & 5.7L WITH 4L60E TRANSMISSION & ALL 2WD WITH 4L80-E TRANSMISSION

Preliminary Steps

CODE 25, MAT SENSOR TEMP. HIGH - 3.8L & 4.3L CPI

CODE 25, MAT SENSOR TEMP. LOW - 4.3L TURBO

CODE 26, QUAD-DRIVER CIRCUIT 3.8L

QDM Symptoms

CODE 26, QUAD-DRIVER NO. 1 CIRCUIT - 4.3L "S" & "T" SERIES PICKUP WITH MANUAL TRANSMISSION

CODE 27, QUAD-DRIVER NO. 2 CIRCUIT - 4.3L "S" & "T" SERIES PICKUP WITH MANUAL TRANSMISSION

CODE 31, PARK/NEUTRAL SWITCH CIRCUIT - 3.8L

CODE 31, TURBO OVERBOOST - 4.3L TURBO

CODE 32, EGR SYSTEM ERROR - 3.1L

CODE 32, EGR SYSTEM ERROR - 4.3L "G" SERIES, 4.3L "C", "K" & "M" SERIES (NON-CALIFORNIA) WITH 4L60E TRANSMISSION & 4.3L "C", "G", "K" & "P" SERIES WITH 4L80-E TRANSMISSION

CODE 32, EGR SYSTEM ERROR 4.3L "S" & "T" SERIES UTILITY VEHICLES WITH MANUAL TRANSMISSION (EXCEPT CPI)

CODE 32, EGR SYSTEM ERROR - 4.3L "C", "K" & "P" SERIES) & 4.3L "S" & "T" SERIES PICKUP (EXCEPT TURBO) WITH MANUAL TRANSMISSION

CODE 32, EGR SYSTEM ERROR - 4.3L TURBO

CODE 32, EGR SYSTEM ERROR - 4.3L WITH LINEAR EGR

CODE 33, MAP SENSOR SIGNAL VOLTAGE HIGH

CODE 34, MAP SENSOR SIGNAL VOLTAGE LOW

CODE 34, MAF SENSOR SIGNAL VOLTAGE LOW - 3.8L

CODE 35, IDLE SPEED ERROR

IAC VALVE RESET PROCEDURE

System Too Lean

System Too Rich

Throttle Body

IAC Valve Connections

PCV Valve

CODE 36, SHIFT CONTROL PROBLEM - 3.8L

CODE 38, BRAKE SWITCH CIRCUIT - 3.8L

CODE 38, KNOCK SENSOR CIRCUIT OPEN - 4.3L "S" & "T" SERIES PICKUP WITH MANUAL TRANSMISSION

CODE 39, TCC CIRCUIT - 3.8L

CODE 39, KNOCK SENSOR CIRCUIT SHORTED - 4.3L "S" & "T" SERIES PICKUP WITH MANUAL TRANSMISSION

CODE 41, CAM SENSOR CIRCUIT - 3.8L

CODE 42, ELECTRONIC SPARK TIMING (EXCEPT 3.8L)

CODE 42, ELECTRONIC SPARK TIMING - 3.8L

CODE 43, ELECTRONIC SPARK CONTROL WITH SPARK CONTROL MODULE

CODE 43, ELECTRONIC SPARK CONTROL WITHOUT ESC MODULE (SINGLE SENSOR) - EXCEPT 4.3L "S" & "T" SERIES PICKUP WITH M/T & 4.3L CPI

CODE 43, ELECTRONIC SPARK CONTROL 4.3L "S" & "T" SERIES WITH M/T & "L" & "M" SERIES WITH 4.3L CPI

CODE 44, LEAN EXHAUST INDICATION (EXCEPT 4.3L TURBO)

O2 Sensor Wire

Fuel Contamination

Fuel Pressure

Exhaust Leaks

CODE 44, LEAN EXHAUST INDICATION - 4.3L TURBO

CODE 45, RICH EXHAUST INDICATION (EXCEPT 4.3L TURBO)

Fuel Pressure High

Ignition Ground

Fuel Canister

MAP Sensor

TPS

O2 Sensor Contamination

EGR Problem

CODE 45, RICH EXHAUST INDICATION - 4.3L TURBO

CODE 51, FAULTY PROM/MEM-CAL

CODE 52, FAULTY CALPAK

CODE 53, SYSTEM OVERVOLTAGE (EXCEPT 3.8L)

CODE 55, ECM/PCM ERROR

CODES 53, 54 & 55, EGR FAULT - 3.8L

CODE 54, FUEL PUMP CIRCUIT

CODE 56, QUAD-DRIVER "B" FAULT 3.8L

QUAD-DRIVER RELATED SYMPTOMS

CODE 61, CRUISE VENT SOLENOID - 3.8L

CODE 62, CRUISE VACUUM SOLENOID - 3.8L

CODE 63, CRUISE SYSTEM PROBLEM - 3.8L

CODE 65, CRUISE SERVO POSITION - 3.8L

CODE 66, LOW A/C REFRIGERANT CHARGE - 3.8L

CODE 67, CRUISE ENGAGE SWITCHES - 3.8L

CODE 68, CRUISE SYSTEM PROBLEM USING TECH 1 - 3.8L

CODE 69, A/C HEAD PRESSURE SWITCH - 3.8L

All sections

CODE 39, TCC CIRCUIT - 3.8L Chevrolet Cutaway P30

Engine Controls - Tests W/codes - v6 1 illustration ~162 words

CODE 39, TCC CIRCUIT - 3.8L

Code 39 will set when TCC is commanded on, vehicle speed is greater than 35 MPH, throttle angle is greater than 10 percent, vehicle is in 3rd or 4th gear, Engine RPM-to-vehicle speed indicates TCC is not locked and all conditions have existed for more than 10 seconds. Code 39 does not turn on SERVICE ENGINE SOON light.

Note. Test numbers refer to numbers on diagnostic chart.

With ALDL test terminal grounded, PCM provides a ground for solenoid. This step tests for power to solenoid.
Tests to see if problem is faulty solenoid, power supply or driver circuit.
Tests TCC solenoid driver circuit at PCM.

Scan tester only indicates when PCM has commanded TCC on. This does not indicate TCC is actually engaged. To determine if TCC is engaging, road test vehicle. Engine RPM should decrease when scan tester indicates TCC engagement.

CODE 39, Flowchart, TCC Circuit (3.8L). Scheme 288

Scheme 288: CODE 39, Flowchart, TCC Circuit (3.8L)

Scheme 288: CODE 39, Flowchart, TCC Circuit (3.8L)