Note. For circuit reference, see the appropriate WIRING DIAGRAMS article. For connector and terminal identification, see CONNECTOR IDENTIFICATION .
Circuit Description
Ignition voltage is supplied directly to 2nd and 3rd gear blockout light. PCM controls light by grounding control circuit through an internal switch called a driver. Primary function of driver is to supply ground for component being controlled. Each driver has a fault line which is monitored by PCM. When PCM is commanding a component on, voltage on control circuit should be low (near zero). When PCM is commanding a component off, voltage of circuit should be high (near battery voltage). If fault detection circuit senses a voltage other that what is expected, fault line will change, causing DTC to set.
DTC will set when following conditions are present
- Engine speed more than 600 RPM.
- PCM detects commanded state of driver and actual state do not match.
- Conditions met for 5 seconds.