B1254
B1254-PTS SENSOR 4 CIRCUIT LOWB1254 - PTS Sensor 4 Circuit Low:
WHEN MONITORED
While the vehicle is in reverse or neutral for speeds less than 16km/h.
SET CONDITION
Sensor ring down time is too short (700 microsecs).
POSSIBLE CAUSES
- (D707) Park assist sensor no. 4 signal circuit shorted to ground
- Park assist sensor no. 4
- Park assist module
DIAGNOSTIC TEST
1. CHECK FOR ACTIVE DTC: B1254-PTS SENSOR 4 CIRCUIT LOW
Turn the ignition on.
Apply the vehicle park brake.
Shift the transmission into reverse.
With the scan tool, record and erase Park Assist Module DTCs.
Wait 30 seconds.
With the scan tool, read Park Assist Module DTCs.
Q: Is DTC: B1254-PTS SENSOR 4 CIRCUIT LOW active?
YES: Go To 2
NO: The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
2. CHECK PARK ASSIST SENSOR NO. 4 FOR A SHORT TO GROUND
Shift the transmission into park.
With the scan tool, erase DTCs.
Turn the ignition off.
Disconnect Park Assist Sensor No. 4.
Turn the ignition on.
Shift the transmission into reverse.
With the scan tool, read Park Assist Module DTCs.
Q: Does the scan tool display: B1254-PTS SENSOR 4 CIRCUIT LOW?
YES: Go To 3
NO: Replace Park Assist Sensor No. 4.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
3. CHECK THE (D707) PARK ASSIST SENSOR NO. 4 SIGNAL CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Park Assist Sensor C2 harness connector.
Measure the resistance between ground and the (D707) Park Assist Sensor No. 4 Signal circuit and ground.
Q: Is the resistance below 10K ohms?
YES: Repair the (D707) Park Assist Sensor No. 4 Signal circuit for a short to ground.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace the Park Assist Module.
Perform BODY VERIFICATION TEST - VER 1. Body Verification Test