Repair manual
Wiring diagrams
Chevrolet Beretta I Repair Manual
Step-by-step repair and maintenance instructions for the Chevrolet Beretta I (1987–1996): removal, installation, adjustment, diagnostics and parameter checks with illustrations.
- THM 3T40 APPLICATION
- THM 4L60/700-R4 APPLICATION (1991-92)
- THM 4T60 & 4T60-E APPLICATION (1991-92)
- THM 4L80-E APPLICATION
- THM 4L80-E SERIES CODE DESIGNATION
- MP6 & MP7 APPLICATIONS (1991-92)
- DIAGNOSTIC FLOW
- DESCRIPTION
- TCC CONTROL COMPONENTS
- Brake Switch
- Coolant Temperature Sensor
- Electronic Control Module (ECM)
- TCC Solenoid Assembly
- Throttle Position Sensor (TPS)
- Vacuum Sensor
- Vehicle Speed Sensor (VSS)
- 3rd & 4th Gear Switches
- TROUBLE SHOOTING
- Problem In Electronic Control Module
- Electrical Problems
- Valve Body Assembly
- Oil Pump Assembly
- CONVERTER CLUTCH APPLY SLIPS, ROUGH OR SHUDDERS
- CONVERTER CLUTCH DOES NOT RELEASE
- DIAGNOSTIC TOOLS
- RETRIEVING TROUBLE CODES
- CLEARING TROUBLE CODES (EXCEPT SATURN)
- CLEARING TROUBLE CODES (SATURN)
- ENTERING SELF-DIAGNOSTICS
- EXITING SELF-DIAGNOSTICS
- DISPLAYING TROUBLE CODES
- CLEARING TROUBLE CODES
- SYSTEM SELECTION
- TEST TYPE SELECTION
- CLEAR CODES
- DATA
- INPUTS
- OUTPUTS
- OVERRIDE
- SNAPSHOT
- EXPLANATION OF SPECIFIC TEST SELECTION
- SPECIFIC TEST SELECTION
- BCM Snapshot
- ECM Snapshot
- STATUS LIGHT INDICATORS
- ECM
- HIGH
- MED
- LOW
- OFF or VENT
- Left-Side AUTO
- °C
- Upper Arrow (Icon)
- BCM
- Lower Arrow (Icon)
- TCC LOCK-UP PROBLEMS
- NO LOCK-UP CONDITION
- BRAKE SWITCH TEST
- CHECKING SELF-DIAGNOSTIC SYSTEM
- TCC APPLY SOLENOID TEST
- NO TCC RELEASE CONDITION
- CHECKING VOLTAGE TO TERMINAL "A" AT TRANSMISSION USING ALDL
- CHECKING VOLTAGE TO TERMINAL "A" AT TRANSMISSION
- CHECKING FOR GROUND AT TERMINAL "D" AT TRANS. USING ALDL
- CHECKING FOR GROUND AT TERMINAL "D" AT TRANSMISSION
- COOLER LINE PRESSURE TEST
- ELECTRICAL SWITCHES TEST
- Single Terminal Switch (8642473) & 2 Terminal Switch
- Single Terminal Switch (8642569 & 8634475) & 2 Terminal
- GROUNDING "D" WIRE AT TRANSMISSION USING ALDL
- SELF-DIAGNOSTIC SYSTEM CHECK REATTA & RIVIERA
- Always Start Electrical Or Electronic Diagnosis Here
- Diagnostic Aids
- CHART A-2, SERVICE ENGINE SOON LIGHT WON'T GO OUT OR FLASH (REATTA & RIVIERA)
- CHART B-1, BCM POWER & GROUNDS - REATTA & RIVIERA
- CHART C, ECCP DISPLAY PROBLEMS (LOSS OF ECCP COMMUNICATIONS) (REATTA & RIVIERA)
- CHART D-2, SERIAL DATA CIRCUIT SHORTED TO VOLTAGE - REATTA & RIVIERA
- CHART A-2, SERVICE ENGINE SOON LIGHT WILL NOT GO OUT OR FLASH - TORONADO & TROFEO
- SELF-DIAGNOSTIC SYSTEM CHECK (NON-CRT TORONADO & TROFEO)
- CHART C, LOSS OF ECCP COMMUNICATIONS (NON-CRT EQUIPPED TORONADO & TROFEO)
- CHART D, LOSS OF COMMUNICATIONS (NON-CRT EQUIPPED TORONADO & TROFEO)
- CHART D-2, SERIAL DATA CIRCUIT SHORTED TO VOLTAGE (NON-CRT EQUIPPED TORONADO & TROFEO)
- CHART C, COLOR CRT UNABLE TO CONTROL ECCP (CRT EQUIPPED TORONADO & TROFEO)
- CHART D, SERIAL DATA CIRCUIT OPEN (CRT EQUIPPED TORONADO & TROFEO)
- CHART D-1, GROUNDED SERIAL DATA CIRCUIT (CRT EQUIPPED TORONADO & TROFEO)
- CHART E, COLOR CRT ABNORMALITIES (CRT EQUIPPED TORONADO & TROFEO)
- Note On Intermittents
- CODE 23, MAT SENSOR SIGNAL VOLTAGE HIGH
- CODE 26, DIAGNOSTIC CIRCUIT CHECK
- SERVICE ENGINE SOON LIGHT INOPERATIVE
- SERVICE ENGINE SOON LIGHT WON'T GO OUT OR FLASH CODE 12
- Hot Light Diagnosis
- QDM CIRCUITS
- Hot Light Diagnosis (C Body)
- CODE 27 OR 28, GEAR SWITCH CIRCUITS - 3.3L WITH 3T40 TRANSAXLE
- CODE 28 OR 29, GEAR SWITCH CIRCUITS - 3.3L A BODY WITH 4T60
- CODE 31, PARK/NEUTRAL SWITCH CIRCUIT - 3.3L & 3.8L
- Poor Connection or Damaged Harness
- Intermittent Test
- CODE 39, TCC CIRCUIT 3.3L WITH 3T40 TRANSAXLE
- CODE 39, TCC CIRCUIT 3.3L & 3.8L WITH 4T60 (440-T4) TRANSAXLE
- CHART C-8, TORQUE CONVERTER CLUTCH ELECTRICAL DIAGNOSIS - 3.1L PFI A & J BODIES (2 OF 2)
- 1st Gear
- 2nd Gear
- 3rd Gear
- CHART C-8C, 4T60 TRANSAXLE 1ST GEAR SWITCH ELECTRICAL DIAGNOSIS - 3.4L PFI W BODY
- CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 1991 E BODY (EXCEPT ELDORADO) 3.8L PFI (VIN L)
- Transaxle Prefunctional Check
- No Indicator Lights On Or Ignition Indicator Light Only On
- Battery Indicator Light On, All Other Indicator Lights Off
- Brake Indicator Light Not On
- Shift "A" And/Or Shift "B" Indicator lights Not On
- Converter Clutch Apply Indicator Light On All The Time
- Converter Clutch MOD Indicator Light On All the Time
- CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 3.8L PFI (VIN L & 1) 1992
- CHART C-8A, TORQUE CONVERTER CLUTCH FUNCTIONAL CHECK - 1992 3.8L PFI (VIN 1)
- CHART C-8B, 4T60 TRANSAXLE SHIFT SOLENOID FUNCTIONAL CHECK - 1992 3.8L PFI (VIN 1)
- Diagnostics Aids
- CODE 23, MAT SENSOR TEMP. LOW - 1991 2.5L & 4.3L TURBO
- CODE 25, MAT SENSOR TEMP. HIGH - 1991 2.5L & 4.3L TURBO
- CODE 25, MAT SENSOR TEMP. HIGH - 1992 2.5L & 4.3L TURBO
- CODE 53, SYSTEM VOLTAGE HIGH - LT. TRUCK
- Notes On Intermittents
- CODE 59, TRANSMISSION TEMPERATURE SENSOR CIRCUIT (LOW TEMPERATURE INDICATED) - LT. TRUCK
- CODE 75, SYSTEM VOLTAGE LOW - LT. TRUCK
- CODE 83, TCC QDM FAULT - LT. TRUCK
- CODE 86, SHIFT SOLENOID "B" STUCK "ON" - LT. TRUCK
- CODE 87, SHIFT SOLENOID "B" STUCK "OFF" - LT. TRUCK
- TORQUE CONVERTER CLUTCH CIRCUIT CHECK - LT. TRUCK
- SHIFT SOLENOID "A" CIRCUIT CHECK - LT. TRUCK
- SHIFT SOLENOID "B" CIRCUIT CHECK - LT. TRUCK
- FORCE MOTOR CIRCUIT CHECK (LT. TRUCK)
- INTRODUCTION
- GENERAL MOTORS A & C CHART REFERENCE
- Ground Circuits
- Power Circuits
- ENGINE SENSORS & SWITCHES
- A/C ON (A/C Request) Switch Test
- A/C Pressure Sensor (All 2.3L & 3.1L J & W Bodies)
- A/C Pressure Switch
- Brake Switch
- Camshaft Sensor (3.8L VIN C)
- Camshaft Sensor (Cadillac Except Brougham)
- Coolant Temperature Sensor (CTS)
- Crankshaft Position Sensor (2.3L IDI)
- Crankshaft Position Sensor (DIS)
- Dual Crank (Combination) Sensor (3.3L C(3)I System)
- Engine Oil Temperature Sensor (Corvette)
- Hall Effect Camshaft Sensor (Cadillac Except Brougham)
- Knock Sensor
- Manifold Absolute Pressure (MAP) Sensor (C-1)
- Manifold Air Temperature (MAT) Sensor
- Mass Airflow Sensor (3.3L & 3.8L)
- Oxygen (O2) Sensor
- Park/Neutral (P/N) Switch (C-1)
- Power Steering (P/S) Pressure Switch (C-1)
- Throttle Position Sensor (TPS)
- Vehicle Speed Sensor (PM Generator Type)
- Vehicle Speed Sensor (LED Type)
- Electric Air Pump (3.4L Man. Trans.)
- Idle Air Control (IAC) Motor & Idle Speed Control (ISC) Motor
- A/C Clutch Relays
- Electric Air Pump Relay (3.4L Man. Trans.)
- Fuel Pump Relay
- SOLENOIDS
- Air Injection Solenoids
- Canister Purge Solenoid
- EGR Solenoid
- FUEL DELIVERY
- Fuel Pressure Regulator (PFI)
- Fuel Pressure Regulator (TBI)
- Fuel Pump Relay (A-5)
- Fuel Pump Relay By-Pass Procedure
- Oil Pressure Switch Fuel Pump Back-Up
- Fuel Injector(s)
- PFI Injector Balance Test (C-2)
- Oxygen Sensor
- Idle Air Control (IAC) Motor
- Idle Speed Control (ISC) Motor (Cadillac Except Brougham)
- Idle Switch (Cadillac Except Brougham)
- IGNITION SYSTEM (EXC. C3I)
- Electronic Spark Timing (EST) Advance System
- Electronic Spark Control (ESC) Retard System, Without ESC Controller (C-5)
- Electronic Spark Control (ESC) Retard System, With ESC Controller (C-5)
- CHART C-4-1 (MISFIRE AT IDLE 3.3L VIN N)
- CHART C-4-2 (MISFIRE UNDER LOAD 3.3L VIN N)
- If OK
- Cylinder Pair Not Firing (1-4, 2-5 or 3-6)
- Single Cylinder or Unpaired Cylinders Not Firing
- Air Pump (Belt-Driven)
- Check Valve
- Deceleration Valve (3.1L "F" Body)
- Electric Air Divert Valve 3.1L, 3.4L & 5.0L & 5.7L "B" & "D" Bodies)
- Air Management System - Pressure Operated Electric Divert/Electric Switching (V8 "F" & "Y" Bodies)
- EXHAUST GAS RECIRCULATION (C-7)
- System Test (Vacuum Operated)
- EGR Control Solenoid (Normally Closed)
- EGR Control Solenoid (Normally Open)
- Digital EGR Valve (2.3L "W" Body)
- Positive Backpressure EGR Valve
- Negative Backpressure EGR Valve
- FUEL EVAPORATION CONTROL (C-3)
- Canister Purge Solenoid (Normally Closed)
- Canister Purge Solenoid (Normally Open)
- Fuel Tank Pressure Control Valve
- Required Service
- Checking PCV Valve Function
- Temperature Sensor (Vacuum Motor Type)
- Vacuum Motor Diaphragm
- Damper Door - Wax Pellet Check ("B" Body)
- MISCELLANEOUS CONTROLS
- A/C CLUTCH (C-10)
- A/C Clutch Relay
- ELECTRIC COOLING FAN (C-12)
- Cooling Fan System & Quad-Driver Check
- Cooling Fan Relay
- Cooling Fan Motor
- HOT LIGHT OR COOLANT TEMPERATURE LIGHT
- Converter Clutch Solenoid
- Converter Lock-Up Signal At Transmission
- Converter Lock-Up Signal From ECM
- Shift Light (Man. Trans.)
- 1-4 Shift System Check (Man. Trans. Corvette)
- 1-4 Shift Light (Man. Trans. Corvette)
- 1-4 Shift Relay (Man. Trans. Corvette)