Pinpoint Test I: DTCS C101A:15, C101A:16 And C101A:29
NOTE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
- I1 CHECK THE DTCS FROM THE ABS MODULE
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self Test - ABS Module.
Is DTC U3003:16 or U3003:17 present?
- Yes
: For DTC U3003:16, GO to PINPOINT TEST A .
For DTC U3003:17, GO to PINPOINT TEST B .
- No : GO to I2 .
- I2 CHECK THE BRAKE BOOSTER AND VACUUM HOSES FOR LEAKS
- Inspect the vacuum hoses, brake booster and brake booster seals for leaks or evidence of leaks.
Are any leaks or evidence of leaks found?
- Yes : REPAIR or INSTALL new components as necessary.
- No : GO to I3 .
- I3 CHECK THE ABS MODULE OUTPUT
- Ignition OFF.
- Disconnect: Brake Booster Vacuum Sensor C149 .
- Ignition ON.
- Measure the voltage
between:
Positive Lead Negative Lead Pin Circuit Pin Circuit C149-1 VCA36 (YE/GN) - Ground
Is the voltage equal to or greater than 4.8 volts?
- Yes : GO to I4 .
- No
: REPAIR the affected circuit for excessive resistance. CLEAR the DTC. REPEAT the self-test.
If the DTC returns, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE .
- I4 CHECK THE VACUUM SENSOR WIRING FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: ABS Module C135 .
- Ignition ON.
- Measure the voltage
between:
Positive Lead Negative Lead Pin Circuit Pin Circuit C149-1 VCA36 (YE/GN) - Ground C149-2 RCA36 (GE/OG) - Ground C149-3 LCA37 (YE/OG) - Ground
Is any voltage present?
- Yes : REPAIR the affected circuit(s).
- No : GO to I5 .
- I5 CHECK THE VACUUM SENSOR WIRING FOR A SHORT TO GROUND
- Ignition OFF.
- Measure the resistance
between:
Positive Lead Negative Lead Pin Circuit Pin Circuit C149-1 VCA36 (YE/GN) - Ground C149-2 RCA36 (GE/OG) - Ground C149-3 LCA37 (YE/OG) - Ground
Are the resistances greater than 10, 000 ohms?
- Yes : GO to I6 .
- No : REPAIR the circuit.
- I6 CHECK THE VACUUM SENSOR WIRING FOR AN OPEN
- Measure the resistance
between:
Positive Lead Negative Lead Pin Circuit Pin Circuit C135-5 VCA36 (YE/GN) C149-1 VCA36 (YE/GN) C135-10 RCA36 (GE/OG) C149-2 RCA36 (GE/OG) C135-37 LCA37 (YE/OG) C149-3 LCA37 (YE/OG)
Are the resistances less than 3 ohms?
- Yes : GO to I7 .
- No : REPAIR the affected circuit(s).
- Measure the resistance
between:
- I7 CHECK THE VACUUM SENSOR WIRING FOR A SHORT TOGETHER
- Measure the resistance
between:
Positive Lead Negative Lead Pin Circuit Pin Circuit C149-1 VCA36 (YE/GN) C149-2 RCA36 (GE/OG) C149-1 VCA36 (YE/GN) C149-3 LCA37 (YE/OG) C149-2 RCA36 (GE/OG) C149-3 LCA37 (YE/OG)
Are the resistances greater than 10, 000 ohms?
- Yes
: INSTALL a new brake booster vacuum sensor.
POWER BRAKE ACTUATION
. DRIVE the vehicle at speeds greater than 10 km/h (6 mph) for at least 4 minutes and CARRY OUT at least 3 stops.
REPEAT the ABS module self-test. If DTC C101A:15, 16 or 29 returns, GO to I8 .
- No : REPAIR the affected circuit(s).
- Measure the resistance
between:
- I8 CHECK FOR CORRECT ABS MODULE OPERATION
- Ignition OFF.
- Disconnect and inspect the ABS module electrical connector.
- Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Connect: ABS Module C135 .
- Make sure the connector seats and latches correctly, then operate the system and determine if the concern is still present.
Is the concern still present?
- Yes
: CHECK OASIS
for any applicable TSBs. If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions.
If no TSBs address this concern, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE .
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.