Engine Controls - System/component Tests - Except Gs-R Acura Integra III

INTRODUCTION

Before testing separate components or systems, perform Basic Diagnostic Procedures in the BASIC TESTING - EXCEPT GS-R article. Since many computer-controlled and monitored components set a Diagnostic Trouble Code (DTC) if they malfunction, also perform procedures in the TESTS W/CODES - EXCEPT GS-R article.

Note. Before disconnecting battery, obtain anti-theft code for radio. After battery is reconnected, CODE will appear on radio display. Enter 5-digit anti-theft code using select buttons and radio will begin working. If code is entered wrong 3 times, leave radio on at least one hour and enter code correctly. Any time radio power is lost, pre-selected radio stations will have to be set. For more information, see owners manual.

Note. Testing individual components does not isolate shorts or opens. Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.

POWERTRAIN CONTROL MODULE

See MALFUNCTION INDICATOR LIGHT (MIL) MALFUNCTION in the TESTS W/CODES - EXCEPT GS-R article for PCM testing.

Scheme 26

ENGINE SENSORS & SWITCHES

All engine performance related sensors and switches should set a DTC if faulty. See the TESTS W/CODES - EXCEPT GS-R article.

RELAYS

Note. Fuel pump relay may also be referred to as PGM-FI main relay.

Fuel Pump (PGM-FI) Relay

See the BASIC TESTING - EXCEPT GS-R article.

EGR Control Solenoid Valve

See the TESTS W/CODES - EXCEPT GS-R article.

EVAP Purge Control Solenoid Valve

See the TESTS W/CODES - EXCEPT GS-R article.

VTEC Solenoid Valve

Disconnect 1-pin connector from VTEC solenoid valve. Measure resistance between terminal and body ground. If resistance is 14-30ohm, remove VTEC solenoid from cylinder head and check valve filter for clogging. If there is clogging, replace engine oil filter and engine oil. If filter is not clogged, check valve movement with finger. If valve movement is normal, check engine oil pressure. (Scheme 27)

Scheme 27

FUEL DELIVERY

Note. For fuel system pressure testing, see procedures in the BASIC TESTING - EXCEPT GS-R article.

Fuel Injector

See the TESTS W/CODES - EXCEPT GS-R article.

Fuel Pressure Regulator

See FUEL SYSTEM in the BASIC TESTING - EXCEPT GS-R article.

Fuel Pump

See FUEL SYSTEM in the BASIC TESTING - EXCEPT GS-R article.

See the BASIC TESTING - EXCEPT GS-R article.

Air Conditioning Signal

1. Turn ignition off. Disconnect A/C pressure switch and A/C diode connectors. A/C pressure switch Gray 2-pin connector is located at left front of engine compartment, between radiator and compressor. A/C diode White 3-pin connector is located under right side of dash, behind kick panel. Turn ignition on. Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and 31-pin connector terminal No. 5 (Blue/Red wire). (Scheme 26) If voltage is not about 5 volts, go to next step. If voltage is about 5 volts, go to step 3).
2. Turn ignition off. Disconnect PCM 31-pin connector. Check continuity between ground and PCM 31-pin connector terminal No. 5 (Blue/Red wire). (Scheme 26) If continuity exists, repair short in Blue/Red wire between PCM 31-pin connector terminal No. 5 and A/C pressure switch or A/C diode. If continuity does not exist, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM. Ensure A/C is operating properly. See the «A/C-HEATER SYSTEM - MANUAL»(/acura/integra/iii-1993-2001/remont/manual-hvac-system/#ac-heater-system-manual) article in the AIR CONDITIONING & HEAT section.
3. Turn ignition off. Reconnect A/C pressure switch and A/C diode connectors. Turn ignition on. Using a fused jumper wire, momentarily connect PCM 32-pin connector terminals No. 9 (Brown/Black wire) and No. 17 (Black/Red wire) several times. (Scheme 26) If A/C clutch does not click, go to next step. If A/C clutch clicks, go to step 5).
4. Locate A/C clutch relay Brown 4-pin connector behind left side of front bumper. Using a fused jumper wire, momentarily connect A/C clutch relay connector terminal Black/Red wire to ground several times. If A/C clutch clicks, repair open in Black/Red wire between PCM 32-pin connector terminal No. 17 and A/C clutch relay 4-pin connector. If A/C clutch does not click, problem is with A/C system. See the «A/C-HEATER SYSTEM - MANUAL»(/acura/integra/iii-1993-2001/remont/manual-hvac-system/#ac-heater-system-manual) article in the AIR CONDITIONING & HEAT section.
5. Start engine. Turn blower motor switch on. Turn A/C switch on. If A/C operates, A/C signal is okay at this time. If A/C does not operate, measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 5 (Blue/Red wire). (Scheme 26) If voltage is one volt or more, repair open in Blue/Red wire between PCM 31-pin connector terminal No. 5 and A/C pressure switch or A/C diode connectors. If voltage is less than one volt, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM. Ensure A/C is operating properly. See the «A/C-HEATER SYSTEM - MANUAL»(/acura/integra/iii-1993-2001/remont/manual-hvac-system/#ac-heater-system-manual) article in the AIR CONDITIONING & HEAT section.

Generator FR Signal

1. Disconnect 4-pin (3-pin connector in Canada) connector from generator. Turn ignition on. Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 17 (White/Red wire). (Scheme 26) If voltage is not about 5 volts, go to next step. If voltage is about 5 volts, go to step 3).
2. Turn ignition off. Disconnect negative battery cable. Disconnect PCM 31-pin connector. Check continuity between ground and PCM 31-pin connector terminal No. 17 (White/Red wire). (Scheme 26) If continuity exists, repair short in White/Red wire between PCM and generator. If continuity does not exist, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM.
3. Turn ignition off. Reconnect generator connector. Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral, until radiator fan comes on. Allow engine to idle. Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 17 (White/Red wire). (Scheme 26) Turn headlights and rear defogger on. If voltage does not decrease, go to next step. If voltage decreases, generator FR signal is okay.
4. Turn ignition off. Disconnect negative battery cable. Disconnect PCM 31-pin connector. Disconnect generator connector. Using a jumper wire, connect generator connector White/Red wire to ground. Check for continuity between ground and PCM 31-pin connector terminal No. 17 (White/Red wire). (Scheme 26) If continuity does not exist, repair open in White/Red wire between PCM and generator. If continuity exists, perform generator performance check. See the «ALTERNATOR & REGULATOR»(/acura/integra/iii-1993-2001/remont/charging-system/#generators-regulators) article in the ELECTRICAL section.

Automatic Transmission Gear Position Signal

1. Turn ignition on. While observing gear indicator, move transmission gear selector lever to each position. If gear indicator does not indicate correct gear position, see the «AUTO TRANS DIAGNOSIS - S4XA»(/acura/integra/iii-1993-2001/remont/automatic-trans/#diagnosis-s4xa) article for gear indicator testing. If gear indicator indicates correctly for all positions, go to next step.
2. Turn ignition off. Disconnect gauge assembly Blue 10-pin connector located behind gauge assembly. Disconnect Transmission control module (TCM) Gray 26-pin connector located behind left kick panel. Turn ignition on. Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 29 (Light Green/Black wire). (Scheme 26) If voltage is about 5 volts, go to step 4). If voltage is not about 5 volts, go to next step.
3. Turn ignition off. Disconnect PCM 31-pin connector. Check for continuity between ground and PCM 31-pin connector terminal No. 29 (Light Green/Black wire). (Scheme 26) If continuity exists, repair short in Light Green/Black wire between PCM and gauge assembly 10-pin connector. See «WIRING DIAGRAMS»(/acura/integra/iii-1993-2001/remont/wiring-diagrams-engine-performance/#wiring-diagrams) article. If continuity does not exist, substitute a known good PCM, then recheck. If symptom or indication goes away, replace original PCM.
4. Turn ignition off. Reconnect 10-pin gauge assemble connector and TCM 26-pin connector. Start engine. Set transmission to Neutral position. Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 29 (Light Green/Black wire). (Scheme 26) If voltage is less than one volt, go to next step. If voltage is one volt or more, repair open in Light Green/Black wire between PCM 31-pin connector terminal No. 29 and gauge assembly 10-pin connector terminal No. 3. If wire is okay, repair open in Green wire between gauge assembly 10-pin connector terminal No. 6 and A/T gear position switch Gray 14-pin connector terminal No. 14 located on right front side of center console.
5. Set transmission to Park position. Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 29 (Light Green/Black wire). (Scheme 26) If voltage is less than one volt, A/T gear position signal is functioning properly. If voltage is one volt or more, repair open in Green/White wire between gauge assembly 10-pin connector terminal No. 4 and A/T gear position switch 14-pin connector terminal No. 12.

Brake Switch Signal

1. Check stoplight operation. If stoplights operate properly, go to step 3). If stoplights stay on, check stoplight switch. Repair or replace switch as necessary. If stoplights do not come on when brake pedal is depressed, check STOP, HORN fuse located in underhood fuse/relay box. See «FUSE IDENTIFICATION»(/acura/integra/iii-1993-2001/remont/testing-diagnostics/#engine-controls-systemcomponent-tests-except-gs-r). See «WIRING DIAGRAMS»(/acura/integra/iii-1993-2001/remont/wiring-diagrams-engine-performance/#wiring-diagrams) article.
2. If fuse is okay, repair open in wire between fuse and stoplight switch. If wire is okay, check stoplight switch. If fuse in not okay, repair short in wire between fuse and stoplight switch. Replace STOP, HORN fuse.
3. Depress brake pedal and measure voltage between specified PCM terminals. See «BRAKE SIGNAL TESTING»(/acura/integra/iii-1993-2001/remont/testing-diagnostics/#engine-controls-systemcomponent-tests-except-gs-r). (Scheme 26) See appropriate wiring diagram in the «WIRING DIAGRAMS»(/acura/integra/iii-1993-2001/remont/wiring-diagrams-engine-performance/#wiring-diagrams) article. If battery voltage exists, brake signal is okay. If battery voltage does not exist, repair open in Green/White wire between PCM connector and brake switch. FUSE IDENTIFICATION Application Fuse No. (Amps) Integra 42 (20) BRAKE SIGNAL TESTING Application Measure Between PCM Connector Terminals Integra A9 (BRN/BLK) & D5 (GRN/WHT) NOTE: Fast idle thermo valve is factory adjusted and should not be disassembled.

Scheme 28

1. Remove intake air duct from throttle body. Ensure engine coolant temperature is less than 86°F (30°C). Start engine and allow to idle. Place finger over lower port in throttle body. (Scheme 28) If air flow is present at lower port in throttle body, go to next step. If air flow is not present, replace fast idle thermo valve and recheck for symptom.
2. Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral, until radiator fan comes on. Allow engine to idle. Fast idle thermo valve should be completely closed. Place finger over lower port in throttle body. If vacuum is felt or engine idle speed decreases, fast idle thermo valve is leaking. Ensure engine coolant level is correct and cooling system is free of air. If okay, replace fast idle thermo valve and recheck for symptom. NOTE: If fast idle thermo valve was removed, perform PCM reset procedure. See PCM RESET PROCEDURE/CLEARING CODES in the «TESTS W/CODES - EXCEPT GS-R»(/acura/integra/iii-1993-2001/remont/testing-diagnostics/#engine-controls-tests-wcodes-except-gs-r) article. NOTE: For Idle Air Control (IAC) valve information and test procedures, see the «TESTS W/CODES - EXCEPT GS-R»(/acura/integra/iii-1993-2001/remont/testing-diagnostics/#engine-controls-tests-wcodes-except-gs-r) article.

Power Steering Pressure (PSP) Switch Signal

1. Turn ignition on. Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 16 (Green wire). (Scheme 26) If voltage is less than one volt, go to step 3). If voltage is one volt or more, go to next step.
2. Turn ignition off. Disconnect PSP switch 2-wire connector. Connect a jumper between PSP switch connector terminals. Turn ignition on. Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 16 (Green wire). (Scheme 26) If less than one volt exists, replace PSP switch. If voltage is one volt or more, repair open in Green wire between PCM and PSP switch. If Green wire is okay, repair open in Black wire between PSP switch and ground connection. See «WIRING DIAGRAMS»(/acura/integra/iii-1993-2001/remont/wiring-diagrams-engine-performance/#wiring-diagrams) article.
3. Start engine. Turn steering wheel slowly and measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 16 (Green wire). (Scheme 26) If battery voltage does not exist, go to next step. If battery voltage exists, PSP signal is okay.
4. Turn ignition off. Disconnect PSP switch 2-pin connector. Turn ignition on. Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 16 (Green wire). (Scheme 26) If battery voltage does not exist, go to next step. If battery voltage exists, replace PSP switch.
5. Turn ignition off. Disconnect PCM 31-pin connector. Check continuity between ground and PCM 31-pin connector terminal No. 16 (Green wire). If continuity exists, repair short in Green wire between PCM and PSP switch. If continuity does not exist, substitute a known good PCM, then recheck for battery voltage. If battery voltage exists, replace original PCM.

Starter Switch Signal

Measure voltage between PCM 32-pin connector terminal No. 9 (Brown/Black wire) and PCM 31-pin connector terminal No. 6 (Blue/White wire) with ignition switch in START position. (Scheme 26) If battery voltage is present, starter signal is okay. If battery voltage is not present, inspect STARTER SIGNAL fuse No. 18 (7.5-amp) located in underdash fuse/relay box. If fuse is okay, repair open in Blue/White wire between PCM 31-pin connector and fuse No. 18. If fuse is blown, repair short in Blue/White wire between PCM 31-pin connector and fuse No. 18 or PGM-FI main relay. Replace fuse No. 18.

IGNITION SYSTEM

Note. For basic ignition checks, see procedures in the BASIC TESTING - EXCEPT GS-R article.

Scheme 29

1. Remove fuel filler cap. Remove fuel tank vapor hose from EVAP 2-way valve. EVAP 2-way valve is located on fuel tank. Connect hose end to a "T" fitting connected to a vacuum/pressure gauge and vacuum pump. (Scheme 29)
2. Slowly apply vacuum while observing vacuum/pressure gauge. Vacuum should stabilize (valve opens) momentarily within specified range. See «EVAP 2-WAY VALVE STABILIZING PRESSURE»(/acura/integra/iii-1993-2001/remont/testing-diagnostics/#engine-controls-systemcomponent-tests-except-gs-r). If vacuum stabilizes within specified range, go to next step. If vacuum stabilizes less than or more than specified range, replace EVAP 2-way valve and retest.
3. Move vacuum pump and vacuum gauge from vacuum side to pressure side. (Scheme 29) Slowly pressurize vapor line while observing gauge. Pressure should momentarily stabilize (valve opens) within specified range. See «EVAP 2-WAY VALVE STABILIZING PRESSURE»(/acura/integra/iii-1993-2001/remont/testing-diagnostics/#engine-controls-systemcomponent-tests-except-gs-r). If pressure stabilizes as specified, valve is okay. If pressure does not stabilize as specified, replace EVAP 2-way valve and retest. EVAP 2-WAY VALVE STABILIZING PRESSURE Application in. Hg (kPa) Vacuum 0.2-0.6 (0.7-2.0) Pressure 0.4-1.4 (1.3-4.7)

EXHAUST GAS RECIRCULATION (EGR)

Note. For EGR diagnostic procedures, see the TESTS W/CODES - EXCEPT GS-R article.

POSITIVE CRANKCASE VENTILATION (PCV)

Ensure crankcase ventilation hoses and connections are not clogged and no leaks exist. Start engine. With engine at idle, pinch and release PCV hose. PCV valve should click. If PCV valve does not click, check PCV valve grommet for cracks or damage. Ensure manifold vacuum exists at valve. If manifold vacuum exists and grommet is okay, replace PCV valve and recheck. If manifold vacuum does not exist, check for restricted vacuum port or PCV hose.

MISCELLANEOUS CONTROLS

Note. Some of the following controlled devices are not technically engine performance components, but they can affect driveability if they malfunction.

A/C Clutch Relay

Relay is located above compressor. Remove relay. Check continuity between terminals No. 1 and 3. (Scheme 30) If continuity exists, replace relay. Using jumper wires, connect 12-volt battery power and ground to terminals No. 2 and 4. Continuity should exist between terminals No. 1 and 3. If continuity does not exist, replace relay.

Scheme 30

See also:
• BASIC TESTING - EXCEPT GS-R
• TESTS W/CODES - EXCEPT GS-R
• A/C-HEATER SYSTEM - MANUAL
• ALTERNATOR & REGULATOR
• AUTO TRANS DIAGNOSIS - S4XA
• WIRING DIAGRAMS
• FUSE IDENTIFICATION