Pinpoint Test K: DTC C1218 - Lamp Anti-Lock Brake System (Abs) Warning Output Failure

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.

NOTE: Repair all other DTCs first before proceeding with this pinpoint test.

K1 RETRIEVE ABS MODULE AND POWERTRAIN CONTROL MODULE (PCM) DTCs
- Connect the scan tool.
- Key in ON position.
- Retrieve ABS module and PCM DTCs.
- Are any DTCs retrieved?
Yes: For ABS module DTCs, GO to the ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX . For PCM DTCs, REFER to INTRODUCTION - HYBRID article .

No: GO to K2.
K2 RETRIEVE THE TRANSMISSION CONTROL MODULE (TCM) FREEZE FRAME DATA
- Retrieve the TCM freeze frame data.
- Record the ABS status PID and the powertrain control module (PCM) total torque desired PID.
- Does the ABS status PID indicate active and the PCM PID indicate greater than 200 Nm (148 lb-ft)?
Yes: GO to K3.

No: CLEAR the DTCs. REPEAT the self-test. If DTC C1218 returns, GO to K4. If DTC C1218 does not return, the system is operating correctly at this time.
K3 MONITOR THE TOTAL TORQUE DESIRED PID IN THE TCM
- Enter the following diagnostic mode on the scan tool: TCM PID.
- Road test the vehicle performing an ABS event while monitoring the total torque desired PID.
- Does the total torque desired PID indicate less than 200 N.m (148 lb-ft)?
Yes: GO to K4.

No: GO to K7.
K4 MONITOR THE ABS STATUS PID IN THE TCM
- Enter the following diagnostic mode on the scan tool: ABS module PID.
- Road test the vehicle performing an ABS event while monitoring the ABS status PID.
- Does the ABS status PID indicate active during the ABS event and inactive during a normal road test?
Yes: GO to K6.

No: GO to K5.
K5 CHECK FOR ABS MODULE OPERATION
- Disconnect the ABS module connector.
- Check for:
  - corrosion.
  - pushed-out pins.
- Connect the ABS module connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes: INSTALL a new HCU. REFER to HYDRAULIC CONTROL UNIT (HCU) - HYBRID . TEST the system for normal operation.

No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTC(s). REPEAT the self-test.
K6 CHECK FOR TCM OPERATION
- Disconnect the TCM.
- Check for:
  - corrosion.
  - pushed-out pins.
- Connect the TCM and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes: INSTALL a new TCM. REFER to AUTOMATIC TRANSAXLE-TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) . CLEAR the DTCs. REPEAT the self-test.

No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
K7 CHECK FOR PCM OPERATION
- Disconnect the PCM.
- Check for:
  - corrosion.
  - pushed-out pins.
- Connect the PCM and make sure it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes: : INSTALL a new PCM. REFER to INSTALLATION . CLEAR the DTC(s). REPEAT the self-test.

No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTC(s). REPEAT the self-test.