DTC Advanced Diagnostics: P0201, P0202, P0203, P0204

DTC P0201:No. 1 Cylinder Injector Circuit Malfunction
DTC P0202:No. 2 Cylinder Injector Circuit Malfunction
DTC P0203:No. 3 Cylinder Injector Circuit Malfunction
DTC P0204:No. 4 Cylinder Injector Circuit Malfunction

General Description

The injector supplies fuel to the engine and is controlled by the powertrain control module (PCM) ON/OFF command. In the PCM, the injector driver receives a drive commands from the CPU and drives the injector. The injector driver monitors injector currents and voltages, and transmits results to the CPU. Also, the CPU monitors the return signal from the injector. If the monitored conditions are abnormal for a specified time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Continuous
Sequence	None
Duration	–
DTC Type	One drive cycle, MIL on

Enable Conditions

Condition	Minimum	Maximum
12 volt battery voltage [BATTERY]	10.0 V	–
State of the engine	Running
Crankshaft position (CKP) sensor	Normal
Camshaft position (CMP) sensor	Normal
Other	Other than during fuel cut-off operation

Malfunction Threshold

One of these conditions occurs at least 30 times (counts once per engine cycle).

	Symptom: Injector current not flowing The injector current is 0.2 - 1 A* or less.
	Symptom: Injector overcurrent The injector current is 12 - 20 A* or more.
	Symptom: PCM terminal (to injector) short to ground The PCM terminal (to injector) voltage is 1 - 1.3 V* or less.
	Symptom: PCM terminal (to injector) short to power The PCM terminal (to injector) voltage is 4.6 - 5 V* or more.
	Symptom: Return signal abnormal The return signal does not change.

*: Varies with driving condition.

Possible Cause

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

P0201

	No. 1 injector failure
	No. 1 injector line open
	No. 1 injector line short to ground
	No. 1 injector line short to power
	No. 4 injector line short to ground

P0202

	No. 2 injector failure
	No. 2 injector line open
	No. 2 injector line short to ground
	No. 2 injector line short to power
	No. 3 injector line short to ground

P0203

	No. 3 injector failure
	No. 3 injector line open
	No. 3 injector line short to ground
	No. 3 injector line short to power
	No. 2 injector line short to ground

P0204

	No. 4 injector failure
	No. 4 injector line open
	No. 4 injector line short to ground
	No. 4 injector line short to power
	No. 1 injector line short to ground

Common

	Injector relay failure
	PCM internal circuit failure (injector driver power supply line open)
	High pressure fuel pump failure

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.