B1178

Factory Manual References

Factory service manual diagnostic procedure for 2008 acura tsx

Check Out These VSA Troubleshooting Tips (B07080B)

Publication date: 2007-08-01
Reference number: B07080B

CHECK OUT THESE VSA TROUBLESHOOTING TIPS

CHECK OUT THESE VSA TROUBLESHOOTING TIPS

TECHNICAL SERVICE BULLETIN

Reference Number(s): B07080B, Date of Issue:  August 01, 2007
ACURA: '04-08 MDXs; '07-08 RDXs; '05-08 RLs; '02-06 RSXs; '04-08 TLs; and '04-08 TSXs
CURRENTLY APPLIES TO: '04-08 MDXs; '07-08 RDXs; '05-08 RLs; '02-06 RSXs; '04-08 TLs; and '04-08 TSXs

SERVICE INFORMATION

Vexed by a VSA troubleshooting problem? Here's a handy chart that can help you out. Keep in mind, this is a generic  chart, so the DTC ID numbers and descriptions may vary slightly with model applicability. If you've still got the problem after following these troubleshooting tips, then refer to the applicable S/M or go into ISIS for more detailed info.

DTC DESCRIPTION CHART

DTC Description Symptom Probable Cause
U0073 or U0028 with any other DTCs F-CAN malfunction (Bus-off)
  • MIL is on
  • No F-CAN communication
  • HDS won't communicate on some models
  • Tachometer, speedometer, and temperature gauge don't work
  • Multiple warning indicators are on
  • Body electrical DTCs B1168, B1169, B1170, and B1178
  • CAN-H wire shorted to ground
  • CAN-H wire shorted to power
  • Bad F-CAN-related control unit
  • Poor power or ground to an F-CAN-related control unit
U0122 only.
No other DTCs.		 F-CAN malfunction (PCM-VSA)
  • MIL is off
  • VSA indicator is on
  • VSA activation indicator is on
  • Poor or no +B FSR voltage
  • Poor or no Ignition 1 voltage
  • Poor or no VSA ground
U0122 with VSA 86
  • F-CAN malfunction (PCM-VSA
  • F-CAN communication
  • MIL is off
  • VSA indicator is on
  • VSA activation indicator is on
  • Poor or no +B FSR voltage
  • Poor or no Ignition 1 voltage
  • Poor or no VSA ground
  • Open or poor connection on F-CAN-H or F-CAN-L wires
25 Yaw rate sensor
  • MIL is off
  • VSA indicator is on
  • VSA activation indicator is on
  • S-GND, YAW, or SVCC open circuit
  • Yaw signal wire shorted to ground
  • Bad yaw rate sensor or cluster sensor
26 Lateral acceleration sensor
  • MIL is off
  • VSA indicator is on
  • VSA activation indicator is on
  • S-GND, GLAT, or SVCC open circuit
  • GLAT signal wire shorted to ground
  • Bad yaw rate-lateral acceleration (cluster) sensor
27 Steering angle sensor
  • MIL is off
  • VSA indicator is on
  • VSA activation indicator is on
  • Open or poor connection on STRA, STRB, or STRD (STRZ) signal wire
  • Short to ground on STRA, STRB, or STRD (STRZ) signal wire
  • Open on S-GND wire
  • Bad steering angle sensor
28 Longitudinal acceleration sensor
  • MIL is off
  • VSA indicator is on
  • VSA activation indicator is on
  • Open or poor connection on GLONG signal wire
  • Short to ground on GLONG signal wire
  • Open on S-GND wire
51 Motor lock
  • MIL is off
  • VSA indicator is on
  • VSA activation indicator is on
  • +B-MR open or poor connection
  • Poor or no VSA ground
53 Motor stuck ON
  • MIL is off
  • VSA indicator is on
  • VSA activation indicator is on
  • Poor or no VSA MOTOR ground
64 Sensor power voltage
  • MIL is off
  • VSA indicator is on
  • VSA activation indicator is on
  • SVCC short to ground or open
68 Brake pedal position switch
  • MIL is off
  • VSA indicator is on
  • VSA activation indicator is on
  • If the VSA modulator-control unit sees brake pressure without a brake pedal position switch signal, check for an open in the brake light circuit or a misadjusted brake pedal position switch.
  • If the VSA modulator-control unit sees the brake pedal position switch is on without brake pressure, check for a short to power in the brake pedal position switch circuit or a misadjusted switch.
86 F-CAN communication
  • MIL is off
  • VSA indicator is on
  • VSA activation indicator is on
  • Poor or no +B FSR voltage
  • Poor or no Ignition 1 voltage
  • Poor or no VSA ground
  • Open or poor connection on F-CAN-H or F-CAN-L wires

A L L Diagnostic Trouble Codes ( DTC )

B1168

DTC B1178: F-CAN Communication Line Error

DTC B1168: Gauge Control Module Lost Communication with ECM/PCM (Engine Messages)

DTC B1169: Gauge Control Module Lost Communication with PCM (A/T Messages)

NOTE: If you are troubleshooting multiple DTC's, be sure to follow the instructions in B-CAN system diagnosis Test Mode A.

1. Clear the DTCs using the HDS.
2. Turn the ignition switch OFF then back to the ON (II).
3. Start and run the engine for at least 5 seconds then turn the engine off.
4. Check for DTCs using the HDS.

Is DTC B1178, B1168, and/or B1169 indicated?

YES - Go to step 5.

NO - Intermittent failure, the F-CAN communication line is OK at this time. Check for loose or poor connections. If the connections are good, check the battery condition and the charging system.

5. Check for DTCs in the ECM/PCM.

Are any DTCs indicated?

YES - Troubleshoot the ECM/PCM DTCs.

NO - Go to step 6.

6. Perform the Gauge Control Module Input Test. Gauge Control Module Input Test

Are all inputs OK?

YES - Go to step 7.

NO - Repair the faulty input then recheck for DTCs.

7. Substitute a known-good gauge control module.
8. Clear the DTCs using the HDS.
9. Turn the ignition switch OFF then back to the ON (II).
10. Start and run the engine for at least 5 seconds then turn the engine off.
11. Check for DTCs using the HDS.

Is DTC B1178, B1168, and/or B1169 indicated?

YES - Replace the ECM/PCM.

NO - The original gauge control module is faulty; replace the gauge control module.

Supporting Diagrams & Locations

Reference material from the factory manual for this diagnostic procedure.

Diagram

A/C Leak Detection (B07-025)

Diagram

A/C Leak Detection (B07-025)

Location

ACURA

Location

AUDI

Location

BENTLEY

Location

BMW

Fuse/Relay

AUDI

Fuse/Relay

BMW

Fuse/Relay

Buzzers, Relays & Timers

Fuse/Relay

Check Out The Latest Word On A/T Flushing (B08010A)

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