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Anti-Lock (except Type R) Acura Integra III

Anti-Lock/traction Control 10 illustrations ~8604 words

DESCRIPTION

The Anti-Lock Brake System (ABS) is designed to prevent wheel lock-up during hard braking. This allows driver to maintain control of vehicle under severe braking conditions. System consists of ABS control unit, accumulator, pressure switch, pump assembly, wheel sensors, gear pulsers, modulator, warning light, master cylinder, power booster assembly, motor and fail-safe relays and connecting wiring. (Scheme 1)

Note. For more information on brake system, see DISC article.

OPERATION

The ABS control unit receives an AC signal from each wheel speed sensor. With this information, ABS control unit electronically opens or closes the solenoids, located inside modulator, to prevent wheel lock-up.

SERVICING

Replace brake fluid every 30,000 miles. Inspect all brake hoses and lines every 15,000 miles.

Scheme 1

Scheme 1: SERVICING
Scheme 1: SERVICING

* PLEASE READ FIRST *

Note. Relieve system pressure before servicing modulator, accumulator or ABS pump motor.

RELIEVING SYSTEM PRESSURE

Remove bleed screw cap from maintenance bleed screw on modulator. (Scheme 2) Attach wrench to maintenance bleed screw. Connect a rubber tube of appropriate diameter to maintenance bleed screw, and place other end in a suitable container. Hold rubber tube, and slowly loosen maintenance bleed screw 1/8-1/4 turn to drain brake fluid from modulator. After fluid stops flowing, loosen bleed screw further to relieve pressure completely. Tighten bleed screw.

Scheme 2

Scheme 2: RELIEVING SYSTEM PRESSURE
Scheme 2: RELIEVING SYSTEM PRESSURE

BLEEDING

  1. Fill brake fluid reservoir to MAX (upper) level with new brake fluid. Connect a rubber tube of appropriate diameter to maintenance bleed screw, and place other end in a suitable container. Loosen maintenance bleed screw. Start engine to activate ABS pump motor.
  2. Tighten bleed screw when fluid begins to flow from bleed screw. Stop engine when ABS pump motor stops. If ABS indicator light illuminates and ABS pump motor stops, start engine and repeat procedure. Ensure brake fluid level is at MAX (upper) level of reservoir.

ABS WARNING LIGHT TROUBLE SHOOTING

ABS warning light will come on for any of following reasons

  1. Brake fluid pump runs longer than preset value.
  2. Vehicle driven longer than 30 seconds with parking brake applied.
  3. Rear wheels locked longer than specified time.
  4. Wheel speed sensor not transmitting a signal.
  5. Operation time of solenoid valves exceeds a specified value or solenoid circuit is open.
  6. Output signals from ABS control unit are not transmitted to solenoid valves.
  7. Strong radio frequency interference.
  8. Temporary loss of traction due to excessive cornering speed or starting from stuck condition (mud, snow or sand).
  9. Vehicle driven on extremely rough road.
  10. Low battery voltage.

If low battery voltage caused problem, recharge battery. Remove ABS fuse No. 2 for 3 seconds. Reinstall fuse, and check light. To reset light for any other condition, turn ignition off. ABS is okay if light goes out after engine is started. If light remains on, check system for trouble codes. See RETRIEVING CODES under DIAGNOSIS & TESTING.

ABS WARNING LIGHT DOES NOT COME ON

  1. If light does not come on when ignition is on, check bulb. Check back-up light fuse No. 15 (10 amps) in underdash fuse relay box. Check Yellow wire between back-up light fuse and instrument panel.
  2. Check Blue/Red wire between instrument panel and ABS control unit. Check ABS control unit ground circuit. If circuits are okay, check ABS control unit connectors. If connectors are okay, install known-good ABS control unit and recheck.

ABS WARNING LIGHT REMAINS ON, BUT DOES NOT FLASH TROUBLE CODES

  1. If warning light stays on after 3 seconds, but does not flash trouble codes, check for loose or poor connection at ABS control unit. If connector is okay, check ABS fuse No. 2. Check for open White wire between ABS fuse No. 2 and ABS control unit.
  2. Check Black/Yellow wire between ABS control unit and rear defroster/cooling fan relay fuse in underdash fuse relay box. Check wire between battery and underhood fuse/relay box. Check for open circuit inside underhood ABS fuse/relay box.
  3. Check for short in Blue/Red wire between instrument panel and ABS control unit. Check for open in White/Blue wire between alternator and ABS control unit. If problem cannot be found, install a known-good ABS control unit and retest.

ABS FUNCTION TEST

Note. Perform ABS function test after any ABS component repair or replacement, system bleeding or repair affecting sensors or wiring.

WARNINGDO NOT drive vehicle with ABS tester connected to vehicle. Loss of braking can occur.

Preliminary Procedure

ABS warning light should come on when ignition is on and go off after engine is started. If light remains on, see ABS WARNING LIGHT TROUBLE SHOOTING . If light goes off, park vehicle on level surface. Block wheels, and place transmission in Park (A/T) or Neutral (M/T).

Testing

  1. Turn ignition switch to OFF position. Connect ABS Tester (07HAJ-SG0010B) to 6-pin inspection connector (located under passenger seat). (Scheme 1) Start engine, and release parking brake. Place mode selector in mode 1. Push START TEST button. TEST-IN-PROGRESS light should come on. DO NOT turn mode selector switch while TEST-IN-PROGRESS light is on.
  2. Ensure all 4 monitor lights on ABS tester come on within 1-2 seconds. ABS warning light should not come on. If light is on, check system for codes. See «RETRIEVING CODES»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__retrieving-codes).
  3. Turn mode selector to mode 2. Depress brake pedal firmly, and push START TEST button. ABS warning light should not come on and kickback should be felt at brake pedal. If light comes on or kickback is not felt, see «ABS WARNING LIGHT TROUBLE SHOOTING»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__abs-warning-light-trouble-shooting).
  4. Repeat step 3) for remaining ABS tester modes (3, 4 and 5). Results should be as described in mode 2. If results differ, see «ABS WARNING LIGHT TROUBLE SHOOTING»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__abs-warning-light-trouble-shooting). Breakdown of modes is as follows

Mode 1

Sends simulated driving signal of each wheel to ABS control unit to check self-diagnostic circuit. No kickback should be felt in brake pedal.

Mode 2

Sends driving signal of each wheel and then sends lock signal of left rear wheel to ABS control unit. Kickback should be felt in brake pedal.

Mode 3

Sends driving signal of each wheel and then sends lock signal of right rear wheel to ABS control unit. Kickback should be felt in brake pedal.

Mode 4

Sends driving signal of each wheel and then sends lock signal of left front wheel to ABS control unit. Kickback should be felt in brake pedal.

Mode 5

Sends driving signal of each wheel and then sends lock signal of right front wheel to ABS control unit. Kickback should be felt in brake pedal.

Mode 6

Not used. If kickback is not felt as described in modes No. 2-5, repeat test several times before trouble shooting other parts of system.

RETRIEVING CODES

  1. Connect SCS Service Connector (07PAZ-0010100) to service check connector located under right side of glove box. (Scheme 1)
  2. Turn ignition switch to ON position. ABS warning light should start flashing Diagnostic Trouble Codes (DTC). If light does not flash DTC, go to «ABS WARNING LIGHT REMAINS ON»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__abs-warning-light-remains-on-but), BUT DOES NOT FLASH TROUBLE CODES under TROUBLE SHOOTING.
  3. First flashing sequence indicates main code of DTC, and second number indicates sub code of DTC. (Scheme 3) A one-second pause separates main and sub codes. Total of 3 DTCs can be set at one time. There is a 5-second pause between DTCs.
  4. To recheck DTC sequence, turn ignition off for a few seconds and then turn it back on. After codes are retrieved, go to appropriate test under «CIRCUIT TESTS»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r).

Scheme 3

Scheme 3
Scheme 3

CLEARING CODES

To clear codes, remove ABS fuse No. 2 for at least 3 seconds, or disconnect ABS control unit connector.

WHEEL SENSOR CHECK

Note. Wheel sensor testing information is not available at time of publication.

SOLENOID LEAK TEST

Note. If solenoid leaks excessively, brake fluid in modulator reservoir will rise when ABS power unit is operated.

Note. Solenoid leak test information is not available at time of publication.

MODULATOR FUNCTION CHECK

Note. Bleed high-pressure fluid from modulator unit before performing modulator function check. Refer to RELIEVING SYSTEM PRESSURE under BLEEDING BRAKE SYSTEM.

  1. Bleed high-pressure fluid from modulator unit. See «RELIEVING SYSTEM PRESSURE»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__relieving-system-pressure) under BLEEDING BRAKE SYSTEM. Raise and support vehicle with safety stands. Have an assistant depress brake pedal firmly. Ensure wheels cannot be rotated. Remove cap and slowly fill reservoir to MAX level with clean brake fluid.
  2. Wait a few minutes, then start engine and allow to idle for a few minutes. Turn engine off. Check brake fluid in reservoir. Fluid should be below MAX level. Fill reservoir to MAX level with clean fluid. Start engine and ensure ABS light goes off.

RELAY TEST

Remove relay to be tested. (Scheme 1) Using ohmmeter, check continuity between terminals "A" and "B". (Scheme 4) Continuity should not exist. Apply battery voltage between terminals "C" and "D". Continuity should now exist between terminals "A" and "B". If continuity is not as specified, replace relay.

Scheme 4

Scheme 4: RELAY TEST
Scheme 4: RELAY TEST

TROUBLE CODES

CodeSystem Affected
1Pump Motor Overrun
1-2Pump Motor Circuit
1-3High Pressure Leakage
1-4Pressure Switch
1-8Accumulator Gas Leakage
2-1Parking Brake Switch
3-1, 3-2, 3-3, 3-4, 3-5, 3-6, 3-7, 3-8Pulser(s)
3-12Different Diameter Tire Used
4-1, 4-2, 4-3, 4-4, 4-5, 4-6, 4-7, 4-8Wheel Speed Sensor(s)
5, 5-1, 5-2, 5-3, 5-4, 5-5, 5-6, 5-7, 5-8Rear Wheel Lock(s)
6Front & Rear Fail-Safe Relays
6-1Front Fail-Safe Relay
6-4Rear Fail-Safe Relay
7-1 & 7-2Front Solenoid(s) Circuit
7-4Rear Solenoid Circuit
8-1ABS Function
8-2CPU Comparison
8-4Integrated Circuit

ABS CONTROL UNIT TROUBLE CODES

Note. Use only high impedance Digital Volt-Ohmmeter (DVOM) for testing.

CODE 1: PUMP MOTOR OVERRUN

  1. Start engine and allow to idle for one minute. Check pump motor and ABS light operation. If pump motor runs for 40 seconds then light comes on, go to next step. If pump motor and light do not operate as described, vehicle is okay at this time.
  2. Check fluid level in modulator reservoir. (Scheme 5) If fluid level is not okay, replace modulator. If fluid level is okay, bleed air from system. See «BLEEDING BRAKE SYSTEM»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r). If ABS light goes out, air was mixed with brake fluid. System is now okay. If ABS light does not go out, turn ignition switch to OFF position and go to next step.
  3. Disconnect modulator 14-pin connector. Check continuity between terminal No. 4 (Yellow wire) and terminal No. 11 (Black wire) of 14-pin connector. If continuity exists, go to next step. If continuity does not exist, replace modulator unit.
  4. Turn ignition switch to ON position. Measure voltage between terminal No. 4 (Yellow wire) of 14-pin connector and ground. If battery voltage does not exist, go to next step. If battery voltage exists, check pressure switch ground connection. If ground connection is okay, repair open Black wire between pressure switch and ground.
  5. Backprobing connector, measure voltage between terminal No. 19 (Yellow wire) of ABS control unit 26-pin connector and ground. If battery voltage exists, repair open Yellow wire between pressure switch and ABS control unit. If battery voltage does not exist, check ABS control unit connectors. If connectors are okay, install known-good ABS control unit and retest.

Scheme 5

Scheme 5
Scheme 5

CODE 1-2: PUMP MOTOR CIRCUIT

  1. Check ABS fuses and replace if necessary. Remove pump motor relay. Test relay and replace if necessary. See «RELAY TEST»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__relay-test) under DIAGNOSIS & TESTING. If relay is stuck in ON position, pump motor may be damaged. If relay is okay, bleed high pressure fluid from modulator bleed screw. See «RELIEVING SYSTEM PRESSURE»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__relieving-system-pressure) under BLEEDING BRAKE SYSTEM.
  2. Remove pump motor relay. Connect jumper wire between "B+" terminal and motor terminal of pump motor relay holder. (Scheme 6) If pump motor runs, go to next step. If pump motor does not run, go to step 8).
  3. Remove jumper wire. Disconnect 3-pin connector from underhood ABS fuse/relay box. Turn ignition on. Measure voltage between motor terminal of pump motor relay holder and ground. If battery voltage does not exist, go to step 11). If battery voltage exists, go to next step.
  4. Measure voltage between Black/Yellow wire of 3-pin connector and ground. If battery voltage is present, go to next step. If battery voltage does not exist, repair open Black/Yellow wire between underdash fuse/relay box and underhood ABS fuse/relay box.
  5. Reconnect 3-pin connector to underhood ABS fuse/relay box. Install pump motor relay. If pump motor operates, go to step 14). If pump motor does not operate, backprobing connector, measure voltage between Yellow/Red wire terminal of underhood ABS fuse/relay box 3-pin connector and ground. If battery voltage exists, go to next step. If battery voltage does not exist, replace underhood ABS fuse/relay box.
  6. Backprobing connector, measure voltage between Yellow/Red wire terminal of ABS control unit 22-pin connector and ground. If battery voltage does not exist, repair open Yellow/Red wire between underhood ABS fuse/relay box and ABS control unit. If battery voltage exists, go to next step.
  7. Reconnect connectors. Bleed high pressure fluid. See «RELIEVING SYSTEM PRESSURE»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__relieving-system-pressure) under BLEEDING BRAKE SYSTEM. Add clean brake fluid if necessary. Start engine and check for DTC 1-2. If DTC 1-2 is still present, replace ABS control unit.
  8. Measure voltage between battery terminal of underhood ABS fuse/relay box and ground. If battery voltage does not exist, repair open White wire between battery and underhood ABS fuse/relay box. If battery voltage is present, measure voltage between underhood ABS fuse/relay box 3-pin connector White wire terminal and ground. If battery voltage is not present, replace underhood ABS fuse/relay box. If battery voltage is present, go to next step.
  9. Disconnect ABS pump motor 2-pin connector. Measure voltage between White wire terminal of pump motor connector and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open White wire between underhood ABS fuse/relay box and pump motor.
  10. Measure voltage between pump motor connector terminals. If battery voltage exists, replace pump motor. If battery voltage does not exist, check pump motor ground connection. If ground connection is okay, repair open Black wire between pump motor and ground.
  11. Disconnect 4-pin connector from underhood ABS fuse/relay box. Measure voltage between Brown/Yellow wire terminal of 4-pin connector and ground. If battery voltage does not exist, go to next step. If battery voltage exists, replace underhood ABS fuse/relay box.
  12. Backprobing connector, measure voltage between Brown/Yellow wire terminal of ABS control unit 26-pin connector and ground. If battery voltage exists, repair open Brown/Yellow wire between underhood ABS fuse/relay box and ABS control unit. If battery voltage does not exist, go to next step.
  13. Check for loose ABS control unit connectors. If connectors are okay, install known-good ABS control unit and retest.
  14. Remove pump motor relay. Disconnect 3-pin connector from underhood ABS fuse/relay box. Check continuity between PMR terminal of pump motor relay holder and ground. (Scheme 6) If continuity does not exist, go to next step. If continuity exists, replace underhood ABS fuse/relay box.
  15. Disconnect ABS control unit 22-pin connector. Check continuity between Yellow/Red wire terminal of 22-pin connector and ground. If continuity exists, Yellow/Red wire between underhood ABS fuse/relay box and ABS control unit is shorted to ground. If continuity does not exist, check for loose ABS control unit connectors. If connectors are okay, install and known-good ABS control unit and recheck.

Scheme 6

Scheme 6
Scheme 6

CODE 1-3: HIGH PRESSURE LEAKAGE

  1. Check modulator for brake fluid leak. If there is no fluid leak, go to next step. If there is fluid leak, tighten modulator fitting or replace modulator if necessary.
  2. Start engine. If ABS pump motor does not operate, go to next step. If pump motor operates, turn engine off after pump motor stops. Wait 30 minutes, to allow accumulator gas to cool, and then restart engine. If pump motor does not operate, go to next step. If pump motor operates, wait until motor stops and then go to next step.
  3. Turn engine off. Disconnect modulator 14-pin connector. Wait 30 minutes, then check continuity between modulator connector Yellow wire and Black wire terminals. If continuity does not exist, replace modulator. If continuity exists, problem is intermittent. Check for loose connectors and terminals in pressure switch circuit.

CODE 1-4: PRESSURE SWITCH

  1. Bleed high pressure fluid from modulator. See «RELIEVING SYSTEM PRESSURE»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__relieving-system-pressure) under BLEEDING BRAKE SYSTEM. Disconnect modulator 14-pin connector. Check continuity between modulator connector Yellow wire and Black wire terminals. If continuity does not exist, go to next step. If continuity exists, visually inspect modulator wire harness. If wire harness is okay, replace modulator.
  2. Disconnect ABS control unit 26-pin connector. Check continuity between Yellow wire terminal of ABS control unit connector and ground. If continuity does not exist, go to next step. If continuity exists, Yellow wire between ABS control unit and modulator is shorted to ground.
  3. Check for loose ABS control unit connectors. If connectors are okay, install known-good ABS control unit and retest.

CODE 1-8: ACCUMULATOR GAS LEAKAGE

  1. Check accumulator relief plug. If plug is damaged, replace accumulator. If plug is okay, start and run engine until ABS light goes off. Turn engine off. Repeat procedure 10 times.
  2. If light goes off each time engine is started, system is okay at this time. If symptom reappears, replace modulator. If light does not go off after each engine start, retrieve ABS trouble codes. If Code 1-8 is set, replace modulator. If Code 1-8 is not set, perform appropriate trouble code repair.

CODE 2-1: PARKING BRAKE SWITCH

  1. Turn ignition on. Set parking brake lever. If BRAKE warning light comes on go to step 5). If BRAKE warning light does not come on, go to next step.
  2. Disconnect gauge assembly 13-pin connector. Measure voltage between Yellow wire terminal of 13-pin harness connector and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Yellow wire between back-up light fuse and gauge assembly.
  3. Remove instrument panel gauge assembly. See «INSTRUMENT PANEL»(/acura/integra/iii-1993-2001/remont/gauges-instrument-panels/#instrument-panel) article.

Check BRAKE warning light bulb. Replace as necessary. Reconnect gauge assembly 13-pin and 16-pin connectors if disconnected. Connect jumper wire between Green/Red wire terminal of 16-pin connector and ground.

4) If BRAKE warning light does not come on, replace gauge assembly printed circuit board. If light comes on, repair open Green/Red wire between gauge assembly and parking brake switch.

5) Release parking brake lever. If BRAKE warning light does not go off, go to step 7). If light goes off, test drive vehicle at minimum speed of 6 MPH for at least 30 seconds. If ABS light comes on, go to next step. If light does not come on, code was probably set because vehicle was driven with parking brake applied for more than 30 seconds.

6) Measure voltage between Green/Red wire terminal of ABS control unit 26-pin harness connector and ground. If battery voltage is present, replace ABS control unit. If battery voltage does not exist, repair open Green/Red wire between gauge assembly and ABS control unit.

7) Check brake fluid level in master cylinder reservoir. If brake fluid level is correct, go to next step. If fluid level is not correct, check front brake pad thickness and brake system for leaks. If no problem is found, fill master cylinder reservoir to the correct level.

8) Disconnect brake fluid level switch connectors. If BRAKE warning light goes off, replace brake fluid level switch. If light does not go off, check parking brake switch and replace if necessary. If switch is okay, disconnect ABS control unit 26-pin connector.

9) If BRAKE warning light goes off, replace ABS control unit. If light does not go off, Green/Red wire between BRAKE warning light, parking brake switch and brake fluid level switch is shorted to ground.

CODES 3-1, 3-2, 3-3, 3-4, 3-5, 3-6, 3-7, 3-8: PULSER

Probable cause is chipped pulser gear or improperly installed speed sensor. Code 3-1 is for right front wheel. Code 3-2 is for left front wheel. Code 3-4 is for right rear wheel. Code 3-8 is for left rear wheel. Repair or replace pulser gear or speed sensor as necessary.

CODE 3-12: DIFFERENT TIRE SIZE USED ON VEHICLE

Code may set if different diameter tires are used on vehicle. ABS control unit checks wheel sensor signals during regular driving. Diagnosis is not performed when parking brake switch signal is ON. ABS indicator light will be turned on when one or more tires has different diameters.

CODE 4-1: RIGHT FRONT WHEEL SPEED SENSOR

  1. Disconnect right front wheel speed sensor 2-pin connector. Measure resistance between speed sensor connector terminals. If resistance is not 600-900 ohms, replace speed sensor. If resistance is 600-900 ohms, go to next step.
  2. Check continuity between Green/Black wire terminal of speed sensor connector and ground. If continuity exists, replace sensor. If continuity does not exist, disconnect ABS control unit 22-pin connector. Check continuity between Green/Black wire terminal of ABS control unit 22-pin connector and ground.
  3. If continuity exists, Green/Black wire between ABS control unit and speed sensor is shorted to ground. If continuity does not exist, check continuity between Green wire terminal of ABS control unit 22-pin connector and ground.
  4. If continuity exists, Green wire between ABS control unit and speed sensor is shorted to ground. If continuity does not exist, reconnect speed sensor 2-pin connector. Measure resistance between Green wire and Green/Black wire terminals of ABS control unit 22-pin connector.
  5. If resistance is 600-900 ohms, go to step 7). If resistance is not 600-900 ohms, connect jumper wire between Green/Black wire terminal of ABS control unit 22-pin connector and ground. Disconnect right front speed sensor 2-pin connector.
  6. Check continuity between speed sensor harness connector Green/Black wire terminal and ground. If continuity exists, repair open Green wire between ABS control unit and speed sensor. If continuity does not exist, repair open Green/Black wire between ABS control unit and speed sensor.
  7. Check right front speed sensor air gap and correct if necessary. See «WHEEL SENSOR AIR GAP SPECIFICATIONS»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r) table under REMOVAL & INSTALLATION. If gap is okay, go to next step.
  8. Connect ABS tester to inspection 6-pin connector. (Scheme 1) Start engine. Turn mode selector on ABS tester to mode 5. Firmly depress and hold brake pedal down. Push START TEST switch.
  9. Have assistant manually rotate right front wheel. If wheel cannot be rotated, replace modulator. If wheels can be rotated, problem is intermittent. Test drive vehicle. If symptom reappears, replace ABS control unit.

CODE 4-2: LEFT FRONT WHEEL SPEED SENSOR

  1. Disconnect left front wheel speed sensor 2-pin connector. Measure resistance between speed sensor connector terminals. If resistance is not 600-900 ohms, replace speed sensor. If resistance is 600-900 ohms, go to next step.
  2. Check continuity between Green/Blue wire terminal of speed sensor connector and ground. If continuity exists, replace sensor. If continuity does not exist, disconnect ABS control unit 22-pin connector. Check continuity between Green/Blue wire (Green/Orange wire on hatchback) terminal of ABS control unit 22-pin connector and ground.
  3. If continuity exists, Green/Blue wire (Green/Orange wire on hatchback) between ABS control unit and speed sensor is shorted to ground. If continuity does not exist, check continuity between Brown wire (Light Green/Black wire on hatchback) terminal of ABS control unit 22-pin connector and ground.
  4. If continuity exists, Brown wire (Light Green/Black wire on hatch back) between ABS control unit and speed sensor is shorted to ground. If continuity does not exist, reconnect speed sensor 2-pin connector. Measure resistance between Brown wire (Light Green/Black wire on hatchback) and Green/Blue wire (Green/Orange wire on hatchback) terminals of ABS control unit 22-pin connector.
  5. If resistance is 600-900 ohms, go to step 7). If resistance is not 600-900 ohms, connect jumper wire between Green/Blue wire (Green/Orange wire on hatchback) terminal of ABS control unit 22-pin connector and ground. Disconnect left front speed sensor 2-pin connector.
  6. Check continuity between speed sensor harness connector Green/Blue wire (Green/Orange wire on hatchback) terminal and ground. If continuity exists, repair open Brown wire (Light Green/Black wire on hatch back) between ABS control unit and speed sensor. If continuity does not exist, repair open Green/Blue wire (Green/Orange wire on hatchback) between ABS control unit and speed sensor.
  7. Check left front speed sensor air gap and correct if necessary. See «WHEEL SENSOR AIR GAP SPECIFICATIONS»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r) table under REMOVAL & INSTALLATION. If gap is okay, go to next step.
  8. Connect ABS tester to inspection 6-pin connector. (Scheme 1) Start engine. Turn mode selector on ABS tester to mode 4. Firmly depress and hold brake pedal down. Push START TEST switch.
  9. Have assistant manually rotate left front wheel. If wheel cannot be rotated, replace modulator. If wheels can be rotated, problem is intermittent. Test drive vehicle. If symptom reappears, replace ABS control unit.

CODE 4-4: RIGHT REAR WHEEL SPEED SENSOR

  1. Disconnect right rear wheel speed sensor 2-pin connector. Measure resistance between speed sensor connector terminals. If resistance is not 700-1100 ohms, replace speed sensor. If resistance is 700-1100 ohms, go to next step.
  2. Check continuity between Green/Yellow wire terminal of speed sensor connector and ground. If continuity exists, replace speed sensor. If continuity does not exist, disconnect ABS control unit 22-pin connector. Check continuity between Green/Yellow wire terminal of ABS control unit 22-pin connector and ground.
  3. If continuity exists, Green/Yellow wire between ABS control unit and speed sensor is shorted to ground. If continuity does not exist, check continuity between Blue/Yellow wire terminal of ABS control unit 22-pin connector and ground.
  4. If continuity exists, Blue/Yellow wire between ABS control unit and speed sensor is shorted to ground. If continuity does not exist, reconnect speed sensor 2-pin connector. Measure resistance between Green/Yellow wire and Blue/Yellow wire terminals of ABS control unit 22-pin connector.
  5. If resistance is 700-1100 ohms, go to step 7). If resistance is not 700-1100 ohms, connect jumper wire between Green/Yellow wire terminal of ABS control unit 22-pin connector and ground. Disconnect right rear speed sensor 2-pin connector.
  6. Check continuity between speed sensor harness connector Green/Yellow wire terminal and ground. If continuity exists, repair open Blue/Yellow wire between ABS control unit and speed sensor. If continuity does not exist, repair open Green/Yellow wire between ABS control unit and speed sensor.
  7. Check right rear speed sensor air gap and correct if necessary. See «WHEEL SENSOR AIR GAP SPECIFICATIONS»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r) table under REMOVAL & INSTALLATION. If gap is okay, go to next step.
  8. Connect ABS tester to inspection 6-pin connector. (Scheme 1) Start engine. Turn mode selector on ABS tester to mode 3. Firmly depress and hold brake pedal down. Push START TEST switch.
  9. Have assistant manually rotate right front wheel. If wheel cannot be rotated, replace modulator. If wheels can be rotated, problem is intermittent. Test drive vehicle. If symptom reappears, replace ABS control unit.

CODE 4-8: LEFT REAR WHEEL SPEED SENSOR

  1. Disconnect left rear wheel speed sensor 2-pin connector. Measure resistance between speed sensor connector terminals. If resistance is not 700-1100 ohms, replace speed sensor. If resistance is 700-1100 ohms, go to next step.
  2. Check continuity between Light Blue wire terminal of speed sensor connector and ground. If continuity exists, replace speed sensor. If continuity does not exist, disconnect ABS control unit 22-pin connector. Check continuity between Light Blue wire terminal of ABS control unit 22-pin connector and ground.
  3. If continuity exists, Light Blue wire between ABS control unit and speed sensor is shorted to ground. If continuity does not exist, check continuity between Gray wire terminal of ABS control unit 22-pin connector and ground.
  4. If continuity exists, Gray wire between ABS control unit and speed sensor is shorted to ground. If continuity does not exist, reconnect speed sensor 2-pin connector. Measure resistance between Light Blue wire and Gray wire terminals of ABS control unit 22-pin connector.
  5. If resistance is 700-1100 ohms, go to step 7). If resistance is not 700-1100 ohms, connect jumper wire between Light Blue wire terminal of ABS control unit 22-pin connector and ground. Disconnect left rear speed sensor 2-pin connector.
  6. Check continuity between speed sensor harness connector Light Blue wire terminal and ground. If continuity exists, repair open Gray wire between ABS control unit and speed sensor. If continuity does not exist, repair open Light Blue wire between ABS control unit and speed sensor.
  7. Check left rear speed sensor air gap and correct if necessary. See «WHEEL SENSOR AIR GAP SPECIFICATIONS»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r) table under REMOVAL & INSTALLATION. If gap is okay, go to next step.
  8. Connect ABS tester to inspection 6-pin connector. (Scheme 1) Start engine. Turn mode selector on ABS tester to mode 2. Firmly depress and hold brake pedal down. Push START TEST switch.
  9. Have assistant manually rotate left rear wheel. If wheel cannot be rotated, replace modulator. If wheels can be rotated, problem is intermittent. Test drive vehicle. If symptom reappears, replace ABS control unit.

CODES 5, 5-4 AND/OR 5-8: REAR WHEEL LOCK

  1. Turn ignition on. Set parking brake lever. If BRAKE warning light comes on, go to next step. If light does not come on, repair open wire between parking brake switch and underdash fuse/relay box, or replace parking brake switch.
  2. Release parking brake lever. Test drive vehicle at speed of 6 MPH. If ABS light does not come on, go to next step. If light comes on, check for ABS trouble codes. If Code 4-4 or 4-8 is set, perform rear wheel speed sensor trouble code test. If Codes 4-4 and 4-8 are not set, perform appropriate trouble code test.
  3. Raise and support vehicle. Spin left and/or right rear wheels and check for brake drag. If rear wheels can be rotated, go to next step. If rear wheels cannot be rotated, repair brake drag as necessary.
  4. Connect ABS tester to inspection 6-pin connector. (Scheme 1) Start engine. Turn mode selector on ABS tester to mode 2. Firmly depress and hold brake pedal. Press START TEST switch. Have assistant manually rotate rear wheels. If wheels cannot be rotated, replace modulator. If wheels can be rotated, problem is intermittent. Replace ABS control unit if symptom reappears.

CODE 6: FRONT & REAR FAIL-SAFE RELAYS

  1. Start engine. If ABS light does not go off, go to next step. If light goes off, system is okay at this time. Check for damaged wire harness between ABS control unit, solenoids and fail-safe relays.
  2. Check for ABS trouble codes. If Code 6 is not set, perform appropriate trouble code test. If Code 6 is set, turn ignition off. Disconnect ABS control unit 22-pin connector. Start engine. Measure voltage between Yellow/Green wire terminal of 22-pin connector and ground.
  3. If battery voltage exists, Yellow/Green wire between ABS control unit and fail-safe relays is shorted to power. If battery voltage does not exist, turn ignition off. Reconnect ABS control unit 22-pin connector. Turn ignition on.
  4. Backprobing connector, measure voltage between Yellow/Green wire terminal of 22-pin connector and ground. If battery voltage exists, replace ABS control unit. If battery voltage does not exist, perform CODE 6-1 and CODE 6-4 tests.

CODE 6-1: FRONT FAIL-SAFE RELAY

  1. Start engine. If ABS light does not go off, go to next step. If ABS light goes off, system is okay at this time. Check for damaged wire harness between ABS control unit, solenoids and front fail-safe relay.
  2. Check for ABS trouble codes. If Code 6-1 is not set, perform appropriate trouble code test. If Code 6-1 is set, test front fail-safe relay and replace if necessary. See «RELAY TEST»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__relay-test) under DIAGNOSIS & TESTING. Disconnect modulator 14-pin connector.
  3. Visually check modulator wire harness for damage and repair or replace as necessary. If wire harness is okay, start engine. Measure voltage between Brown/Black wire terminal of front fail-safe relay connector and ground.
  4. If battery voltage does not exist, go to next step. If battery voltage exists, Brown/Black wire between front fail-safe relay and modulator is shorted to power.
  5. Stop engine. Disconnect ABS control unit 26-pin connector. Start engine. Measure voltage between Red/Black wire terminal of 26-pin connector and ground. If battery voltage does not exist, go to next step. If battery voltage exists, Red/Black wire between ABS control unit and modulator is shorted to power.
  6. Measure voltage between Red/Blue wire terminal of 26-pin connector and ground. If battery voltage does not exist, go to next step. If battery voltage exists, Red/Blue wire between ABS control unit and modulator is shorted to power.
  7. Measure voltage between Yellow/Black wire terminal of 26-pin connector and ground. If battery voltage does not exist, go to next step. If battery voltage exists, Yellow/Black wire between ABS control unit and modulator is shorted to power.
  8. Measure voltage between Yellow/Blue wire terminal of 26-pin connector and ground. If battery voltage exists, Yellow/Blue wire between ABS control unit and modulator is shorted to power. If battery voltage does not exist, check for loose ABS control unit connectors. If connectors are okay, install known-good ABS control unit and retest.

CODE 6-4: REAR FAIL-SAFE RELAY

  1. Start engine. If ABS light does not go off, go to next step. If ABS light goes off, system is okay at this time. Check for damaged wire harness between ABS control unit, solenoids and rear fail-safe relay.
  2. Check for ABS trouble codes. If Code 6-4 is not set, perform appropriate trouble code test. If Code 6-4 is set, test rear fail-safe relay and replace if necessary. See «RELAY TEST»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__relay-test) under DIAGNOSIS & TESTING. Disconnect modulator 14-pin connector.
  3. Visually check modulator wire harness for damage and repair or replace as necessary. If wire harness is okay, start engine. Measure voltage between Blue/Black wire terminal of rear fail-safe relay connector and ground.
  4. If battery voltage does not exist, go to next step. If battery voltage exists, Blue/Black wire between rear fail-safe relay and modulator is shorted to power.
  5. Stop engine. Disconnect ABS control unit 26-pin connector. Start engine. Measure voltage between Red/White wire terminal of 26-pin connector and ground. If battery voltage does not exist, go to next step. If battery voltage exists, Red/White wire between ABS control unit and modulator is shorted to power.
  6. Measure voltage between Yellow/White wire terminal of 26-pin connector and ground. If battery voltage exists, Yellow/White wire between ABS control unit and modulator is shorted to power. If battery voltage does not exist, check for loose ABS control unit connectors. If connectors are okay, install known-good ABS control unit and retest.

Scheme 7

Scheme 7: CODE 7-1: RIGHT FRONT SOLENOID
Scheme 7: CODE 7-1: RIGHT FRONT SOLENOID
  1. Start engine. If ABS light does not go off, go to next step. If light goes off, system is okay at this time. Check for an intermittent open or short circuit in connectors and wire harness between ABS control unit, fail-safe relay and modulator.
  2. Check for ABS trouble codes. If Code 7-1 is not set, perform appropriate trouble code test. If Code 7-1 is set, disconnect modulator 14-pin connector. Remove front fail-safe relay. Connect jumper wire between White/Green wire and Brown/Black wire terminals of fail-safe relay harness connector. NOTE: Modulator 14-pin connector has more than one Brown/Black wire. Ensure appropriate wire is tested. See «WIRING DIAGRAMS»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r).
  3. Measure voltage between modulator terminal No. 5 (Brown/Black wire) and ground. (Scheme 7) If battery voltage exists, go to next step. If battery voltage does not exist, repair open Brown/Black wire between front fail-safe relay and modulator.
  4. Measure voltage between modulator terminal No. 8 (Brown/Black wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Brown/Black wire between front fail-safe relay and modulator.
  5. Measure resistance between modulator connector terminals for inlet and outlet solenoids type "A" and type "B". (Scheme 7) See «SOLENOID RESISTANCE»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r) table. If resistance is as specified, go to next step. If resistance is not as specified, inspect modulator wire harness. If wire harness is okay, replace modulator. SOLENOID RESISTANCE Between 14-Pin Pin Nos. (Wire Color) Type "A" Ohms Type "B" Ohms Right Front Inlet Solenoid 8 (WHT/BLK) & 12 (RED/BLK) 2.5-2.9 6.5-7.5 Rear Inlet Solenoid 9 (WHT) & 13 (RED/WHT) 2.5-2.9 6.5-7.5 Left Front Inlet Solenoid 10 (WHT/BLU) & 14 (RED/BLU) 2.5-2.9 6.5-7.5 Right Front Outlet Solenoid 1 (YEL/BLK) & 5 (GRY/BLK) 2.5-2.9 3.3-3.9 Rear Outlet Solenoid 2 (YEL/WHT) & 6 (GRY/WHT) 2.5-2.9 3.3-3.9 Left Front Outlet Solenoid 3 (YEL/BLU) & 7 (GRY/BLU) 2.5-2.9 3.3-3.9
  6. Check continuity between 14-pin modulator connector terminal No. 1 (Yellow/Black wire) and ground. If continuity does not exist, go to next step. If continuity exists, inspect modulator wire harness and repair as necessary. If wire harness is okay, replace modulator.
  7. Check continuity between 14-pin modulator connector terminal No. 12 (Red/Black wire) and ground. If continuity does not exist, go to next step. If continuity exists, replace modulator wire harness.
  8. Check continuity between 14-pin modulator connector terminals No. 1 (Yellow/Black wire) and No. 12 (Red/Black wire). If continuity does not exist, go to next step. If continuity exists, replace modulator wire harness.
  9. Disconnect ABS control unit 26-pin connector. Check continuity between Yellow/Black wire terminal of 26-pin connector and ground. If continuity does not exist, go to next step. If continuity exists, Yellow/Black wire between ABS control unit and modulator is shorted to ground.
  10. Check continuity between Red/Black wire terminal of 26-pin connector and ground. If continuity does not exist, go to next step. If continuity exists, Red/Black wire between ABS control unit and modulator is shorted to ground.
  11. Check continuity between Red/Black wire and Yellow/Black wire terminals of 26-pin connector. If continuity does not exist, go to next step. If continuity exists, repair short between Red/Black wire and Yellow/Black wire. See «WIRING DIAGRAMS»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r).
  12. Reconnect modulator 14-pin connector. Measure voltage between Yellow/Black wire terminal of ABS control unit 26-pin connector and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Yellow/Black wire between ABS control unit and modulator.
  13. Measure voltage between Red/Black wire terminal of ABS control unit 26-pin connector and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Red/Black wire between ABS control unit and modulator.
  14. Check continuity between Black wire terminal of 26-pin connector and ground. If continuity does not exist, check ground connection. If ground connection is okay, repair open Black wire between ABS control unit and ground.
  15. If continuity exists, check for loose ABS control unit connectors. If connectors are okay, install a known-good ABS control unit and retest.

CODE 7-2: LEFT FRONT SOLENOID

  1. Start engine. If ABS light does not go off, go to next step. If light goes off, system is okay at this time. Check connectors and wire harness between ABS control unit, fail-safe relay and modulator.
  2. Check for ABS trouble codes. If Code 7-2 is not set, perform appropriate trouble code test. If Code 7-2 is set, check ABS No. 1 fuse (20-amp) in underhood ABS fuse/relay box. If fuse is okay, go to next step. If fuse is not okay, replace fuse and recheck system. (Scheme 6)
  3. Backprobing connector, measure voltage between ABS fuse/relay box 4-pin connector White/Green wire terminal and ground. If battery voltage exists, go to next step. If battery voltage does not exist, replace underhood ABS fuse/relay box.
  4. Remove front fail-safe relay. Measure voltage between fail-safe relay 4-pin connector White/Green wire terminal and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in White/Green wire between underhood ABS fuse/relay box and front fail-safe relay. NOTE: Modulator 14-pin connector has more than one Brown/Black wire. Ensure appropriate wire is tested. See «WIRING DIAGRAMS»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r).
  5. Test front fail-safe relay and replace as necessary. See «RELAY TEST»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__relay-test) under DIAGNOSIS & TESTING. Disconnect modulator 14-pin connector. Remove front fail-safe relay. Connect a jumper wire between fail-safe relay connector White/Green wire and Brown/Black wire terminals.
  6. Measure voltage between modulator 14-pin connector terminal No. 7 (Brown/Black wire) and ground. (Scheme 7) If battery voltage exists, go to next step. If battery voltage does not exist, repair open Brown/Black wire between front fail-safe relay and modulator unit.
  7. Measure voltage between modulator 14-pin connector terminal No. 10 (Brown/Black wire) and ground. If battery voltage does not exist, repair open Brown/Black wire between front fail-safe relay and modulator unit. If battery voltage exists, measure resistance between modulator connector terminals for inlet and outlet solenoids type "A" and type "B". (Scheme 7) See «SOLENOID RESISTANCE»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r) table. If resistance is as specified, go to next step. If resistance is not as specified, inspect modulator wire harness. If wire harness is okay, replace modulator.
  8. Check continuity between 14-pin modulator connector terminal No. 3 (Yellow/Blue wire) and ground. If continuity does not exist, go to next step. If continuity exists, inspect modulator wire harness and repair as necessary. If wire harness is okay, replace modulator.
  9. Check continuity between modulator connector terminal No. 14 (Red/Blue wire) and ground. If continuity does not exist, go to next step. If continuity exists, inspect modulator wire harness and repair as necessary. If wire harness is okay, replace modulator.
  10. Check for continuity between 14-pin modulator connector terminal No. 14 (Red/Blue wire) and terminals No. 1 (Yellow/Black wire), No. 3 (Yellow/Blue wire) and No. 12 (Red/Black wire). If continuity does not exist, go to next step. If continuity exists, replace modulator wire harness.
  11. Check for continuity between 14-pin modulator connector terminal No. 3 (Yellow/Blue wire) and terminals No. 1 (Yellow/Black wire) and No. 12 (Red/Black wire). If continuity does not exist, go to next step. If continuity exists, replace modulator wire harness.
  12. Disconnect 26-pin ABS control unit connector. Check for continuity between 26-pin ABS control unit connector Yellow/Blue wire terminal and ground. If continuity does not exist, go to next step. If continuity exists, repair short to ground in Yellow/Blue wire between ABS control unit and modulator.
  13. Check for continuity between 26-pin ABS control unit connector Red/Blue wire terminal and ground. If continuity does not exist, go to next step. If continuity exists, repair short to ground in Red/Blue wire between ABS control unit and modulator.
  14. Check for continuity between 26-pin ABS control unit connector terminal No. 1 (Red/Blue wire) and terminals No. 2 (Red/Black wire), No. 14 (Yellow/Blue wire) and No. 15 (Yellow/Black wire). If continuity does not exist, go to next step. If continuity exists, repair short between Red/Blue wire and Yellow/Blue wire, Red/Black wire or Yellow/Black wire from ABS control unit and modulator.
  15. Connect 14-pin modulator connector. Measure voltage between 26-pin ABS control unit connector terminal No. 1 (Red/Blue wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Red/Blue wire between ABS control unit and modulator.
  16. Measure voltage between 26-pin ABS control unit connector terminal No. 14 (Yellow/Blue wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Yellow/Blue wire between ABS control unit and modulator.
  17. Disconnect 22-pin ABS control unit connector. Check for continuity between 26-pin ABS control unit connector terminal No. 25 (Black wire) and ground. If continuity exists, go to next step. If continuity does not exist, repair open in Black wire between ABS control unit and ground.
  18. Remove rear fail-safe relay. Remove jumper wire installed instep 5) from front fail-safe relay connector. Check for continuity between 22-pin ABS control unit connector terminal No. 1 (Yellow/Green wire) and ground. If continuity does not exist, go to next step. If continuity exists, repair short to ground in Yellow/Green wire.
  19. Connect a jumper wire between front fail-safe relay connector Yellow/Green wire terminal and ground. Check for continuity between 22-pin connector Yellow/Green wire terminal and ground. If continuity exists, go to next step. If continuity does not exist, repair open in Yellow/Green wire between ABS control unit and front fail-safe relay.
  20. Check for continuity between 4-pin front fail-safe relay connector Black wire terminal and ground. If continuity does not exist, check ground connection. If ground connection is okay, repair open Black wire between front fail-safe relay and ground.
  21. If continuity exists, check for loose ABS control unit connectors. If connectors are okay, install known-good ABS control unit and retest.

CODE 7-4: REAR SOLENOID

  1. Start engine. If ABS light does not go off, go to next step. If light goes off, system is okay at this time. Check connectors and wire harness between ABS control unit, fail-safe relay and modulator.
  2. Check for ABS trouble codes. If Code 7-4 is not set, perform appropriate trouble code test. If Code 7-4 is set, remove rear fail-safe relay. Measure voltage between White wire terminal of fail-safe relay connector and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open White wire between underhood ABS fuse/relay box and rear fail-safe relay.
  3. Test rear fail-safe relay and replace if necessary. See «RELAY TEST»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__relay-test) under DIAGNOSIS & TESTING. If rear fail-safe relay is okay, go to next step. NOTE: Modulator 14-pin connector has more than one Blue/Black wire. Ensure appropriate wire is tested. See «WIRING DIAGRAMS»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r).
  4. Disconnect 14-pin modulator connector. Connect jumper wire between White wire and Blue/Black wire terminals of rear fail-safe relay. Measure voltage between modulator 14-pin harness connector terminal No. 6 (Blue/Black wire) and ground. (Scheme 7)
  5. If battery voltage does not exist, repair open in Blue/Black wire between rear fail-safe relay and modulator. If battery voltage exists, measure voltage between modulator 14-pin harness connector terminal No. 9 (Blue/Black wire) and ground.
  6. If battery voltage does not exist, repair open in Blue/Black wire between fail-safe relay and modulator. If battery voltage exists, measure resistance between modulator connector terminals for inlet and outlet solenoids type "A" and type "B". (Scheme 7) See «SOLENOID RESISTANCE»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r) table. If resistance is as specified, go to next step. If resistance is not as specified, inspect modulator wire harness. If wire harness is okay, replace modulator.
  7. Check continuity between 14-pin modulator connector terminal No. 2 (Yellow/White wire) and ground. If continuity does not exist, go to next step. If continuity exists, inspect modulator wire harness. If wire harness is okay, replace modulator.
  8. Check continuity between 14-pin modulator connector terminal No. 13 (Red/White wire) and ground. If continuity does not exist, go to next step. If continuity exists, inspect modulator wire harness. If wire harness is okay, replace modulator.
  9. Check for continuity between 14-pin modulator unit connector Yellow/White wire terminal and Red/White wire terminal. If continuity does not exist, go to next step. If continuity exists, replace modulator wire harness.
  10. Check for continuity between 14-pin modulator connector terminal No. 13 (Red/White wire) and terminals No. 1 (Yellow/Black wire), No. 3 (Yellow/Blue wire), No. 12 (Red/Black wire) and No. 14 (Red/Blue wire). If continuity does not exist, go to next step. If continuity exists, replace modulator wire harness.
  11. Check for continuity between 14-pin modulator connector terminal No. 2 (Yellow/White wire) and terminals No. 1 (Yellow/Black wire), No. 3 (Yellow/Blue wire), No. 12 (Red/Black wire) and No. 14 (Red/Blue wire). If continuity does not exist, go to next step. If continuity exists, replace modulator wire harness.
  12. Disconnect 26-pin ABS control unit connector. Check continuity between 26-pin connector Yellow/White wire terminal and ground. If continuity does not exist, go to next step. If continuity exists, repair short to ground Yellow/White wire between ABS control unit and modulator unit.
  13. Check continuity between 26-pin connector Red/White wire terminal and ground. If continuity does not exist, go to next step. If continuity exists, repair short to ground Red/White wire between ABS control unit and modulator unit.
  14. Check for continuity between 26-pin ABS control unit connector terminal No. 3 (Red/White wire) and No. 16 (Yellow/White wire). If continuity does not exist, go to next step. If continuity exists, repair short between Red/White and Yellow/White wires.
  15. Check for continuity between 26-pin ABS control unit connector terminal No. 3 (Red/White wire) and terminals No. 1 (Red/Blue wire), No. 2 (Red/Black wire), No. 14 (Yellow/Blue wire) and No. 15 (Yellow/Black wire). If continuity does not exist, go to next step. If continuity exists, repair short between Red/White wire and Red/Blue wire, Red/Black wire, Yellow/Blue wire or Yellow/Black wire between ABS control unit and modulator unit.
  16. Check for continuity between 26-pin ABS control unit connector terminal No. 16 (Yellow/White wire) and terminals No. 1 (Red/Blue wire), No. 2 (Red/Black wire), No. 14 (Yellow/Blue wire) and No. 15 (Yellow/Black wire). If continuity does not exist, go to next step. If continuity exists, repair short between Yellow/White wire and Red/Blue wire, Red/Black wire, Yellow/Blue wire or Yellow/Black wire between ABS control unit and modulator unit.
  17. Reconnect 14-pin modulator connector. Measure voltage between ABS control unit 26-pin connector Yellow/White wire terminal and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Yellow/White wire between ABS control unit and modulator.
  18. Measure voltage between ABS control unit 26-pin connector Red/White wire terminal and ground. If battery voltage exists, go to next step. If battery voltage does not exist, repair open Red/White wire between ABS control unit and modulator.
  19. Disconnect 22-pin ABS control unit connector. Check for continuity between 22-pin connector Black wire terminal and ground. If continuity exists, go to next step. If continuity does not exist, check ground connection. If ground connection is okay, repair open Black wire between ABS control unit and ground.
  20. Remove jumper wire from rear fail-safe relay. Remove front fail-safe relay. Check continuity between 22-pin ABS control unit connector Yellow/Green wire terminal and ground. If continuity does not exist, go to next step. If continuity exists, repair Yellow/Green wire shorted to ground between ABS control unit and rear fail-safe relay.
  21. Connect a jumper wire between 4-pin rear fail-safe connector Yellow/Green wire terminal and ground. Check for continuity between 22-pin ABS control unit connector terminal No. 1 (Yellow/Green wire) and ground. If continuity exists, go to next step. If continuity does not exist, repair open Yellow/Green wire between ABS control unit and rear fail-safe relay.
  22. Remove jumper wire from rear fail-safe relay connector. Check continuity between 4-pin rear fail-safe relay connector Black wire terminal and ground. If continuity does not exist, check ground connection. If ground connection is okay, repair open Black wire between rear fail-safe relay and ground. If continuity exists, check for loose ABS control unit connectors. If connectors are okay, install known-good ABS control unit and retest.

CODE 8-1: ABS FUNCTION

  1. Test drive vehicle at minimum speed of 12 MPH for at least 2 minutes. If ABS light comes on, go to next step. If light does not come on, system is okay at this time. Check wheel speed sensor connections. If connections are okay, code was probably caused by rough road condition.
  2. Check for ABS trouble codes. If Code 8-1 is set, replace ABS control unit. If Code 8-1 is not set, perform appropriate trouble code test.

CODE 8-2: CPU COMPARISON

Start engine. If ABS light does not come on, system is okay at this time. If ABS light comes on, check for ABS trouble codes. If Code 8-2 is set, replace ABS control unit. If Code 8-2 is not set, perform appropriate trouble code test.

CODE 8-4: INTEGRATED CIRCUIT (IC)

Replace ABS control unit if Code 8-4 is set. No other information is available at time of publication.

MODULATOR/ABS PUMP ASSEMBLY

WARNINGAccumulator contains high-pressure nitrogen gas. DO NOT puncture, expose to flame or attempt to disassemble accumulator. It could explode and cause severe injury.

Removal & Installation

  1. Bleed high-pressure fluid from maintenance bleed screw. See «RELIEVING SYSTEM PRESSURE»(/acura/integra/iii-1993-2001/remont/anti-locktraction-control/#anti-lock-except-type-r__relieving-system-pressure) under BLEEDING BRAKE SYSTEM. Remove flange bolts. Disconnect 14-pin connector from modulator. (Scheme 1) Disconnect pump motor 2-pin connector.
  2. Remove wire harness clips from modulator bracket. Remove nuts (8-mm) and remove modulator from bracket. Remove 8-mm flange bolts, and remove pump motor from modulator.
  3. Relieve pressure from accumulator before disposing. Secure modulator in vise with relief plug pointing straight up. (Scheme 8) Slowly turn relief plug 3 1/2 turns, and wait at least 3 minutes for all pressure to escape. Remove accumulator from modulator. Remove relief plug, and dispose of accumulator.
  4. To install new modulator/pump assembly, reverse removal procedure. Check letters stamped on modulator to ensure brake pipes are properly connected. Start engine and allow it to idle from one minute. Ensure ABS light is off and brake fluid is not leaking from brake pipe joints.
  5. Stop engine. Fill modulator reservoir to MAX line with clean brake fluid. Bleed brake system. See «DISC»(ref-47653) article.

Scheme 8

Scheme 8
Scheme 8

Unplug wheel sensor connector. Remove wheel sensor from vehicle. (Scheme 1) To install, reverse removal procedure. Ensure wheel sensor-to-pulser air gap is within specification. See WHEEL SENSOR AIR GAP SPECIFICATIONS table.

ApplicationIn. (mm)
Integra.016-.039 (.40-1.00)

WHEEL SENSOR AIR GAP SPECIFICATIONS

TORQUE SPECIFICATIONS

ApplicationFt. Lbs. (N.m)
Caliper Body Mounting Bolt
Front23 (31)
Rear17 (23)
Caliper Mount Bracket Bolt
Front80 (108)
Rear28 (39)
Flex Hose-To-Caliper Banjo Bolt25 (34)
Master Cylinder Mounting Nuts11 (15)
Modulator Set Plate Bolts11 (15)
Push Rod Lock Nut11 (15)
Rear Caliper Parking Nut20 (27)
Rear Spindle Nut134 (181)
Speed Sensor Mounting Bolts(1)
Wheel Lug Nut80 (108)
INCH Lbs. (N.m)
Brake Bleed Screw80 (9)
Maintenance Bleed Screw97 (11)
Brake Booster Mounting Nut115 (13)
(1) Tighten bolts to 89 INCH lbs. (10 N.m).
(1)Tighten bolts to 89 INCH lbs. (10 N.m).

TORQUE SPECIFICATIONS

Anti-Lock Brake System Wiring Diagram (1 Of 2). Scheme 9

Scheme 9: Anti-Lock Brake System Wiring Diagram (1 Of 2)
Scheme 9: Anti-Lock Brake System Wiring Diagram (1 Of 2)

Anti-Lock Brake System Wiring Diagram (2 Of 2). Scheme 10

Scheme 10: Anti-Lock Brake System Wiring Diagram (2 Of 2)
Scheme 10: Anti-Lock Brake System Wiring Diagram (2 Of 2)

More articles — Brakes