The PCM monitors vehicle speed signal from ABS (or ESP) control every 30 seconds, if no signal is detected for more than 20 seconds, the PCM sets a P2159 DTC.
Item | Detecting Condition | Possible cause | |
DTC Strategy |
•
Detects the lack of vehicle speed signal | 1. Poor connection 2. Open or short in harness 3. Wheel speed sensor(FR) 4. ABS or ESP control unit 5. PCM | |
Enable Conditions | Case 1 |
•
Engine Running
•
No VSS disabling malfunction present
•
No TPS fault present
•
No MAP fault present
•
Ignition Voltage between 11V and 16V
•
Engine Coolant Temperature higher than 60℃(140℉)
•
MAP greater than 55 kPa (7.98 psi)
•
TPS between 25% and 60%
•
Engine Speed between 1200 rpm and 4000 rpm
•
Vehicle Speed derived from transmission faster than 10 kph (6.2 mph) | |
Case 2 |
•
Engine Running
•
No VSS disabling malfunction present
•
No TPS fault present
•
No MAP fault present
•
Ignition Voltage between 11V and 16V
•
Engine Coolant Temperature higher than 60℃(140℉)
•
MAP less than 32 kPa (4.64 psi)
•
TPS less than 1%
•
Engine Speed between 1800 rpm and 6000 rpm
•
Transmission in gear | ||
Threshold value | Case 1 |
•
Vehicle Speed slower than 10 kph (6.2 mph) | |
Case 2 |
•
Vehicle Speed slower than 5kph (3.1 mph)
•
Delta Engine Speed higher than 100rpm | ||
Diagnosis Time |
•
Continuous (More than 20 seconds failure for every 30 seconds test ) | ||
MIL On Condition |
•
3 Driving Cycles | ||
