DTC P1540 (VSP_S): Vehicle Speed Sensor Malfunction
- Check speedometer operation. If speedometer operation is abnormal, check power supply and ground circuit to combination meter and connector between combination meter and vehicle speed sensor (VSS). Repair or replace parts as necessary. If speedometer operation is normal, go to next step.
- Turn ignition off. Disconnect TCM connector. Turn ignition on. Using DVOM connected to chassis ground, backprobe ECM harness connector terminal No. 83. See appropriate wiring diagram in WIRING DIAGRAMS article. If voltage reading is more than 2 volts, repair wiring. If voltage reading is 2 volts or less, go to next step.
- Turn ignition off. Disconnect ECM connector. Check resistance between ECM connector terminal No. 83 and ground. If resistance is less than 10 ohms, repair short to ground. If resistance is 10 ohms or more, repair poor contact at ECM.