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 CPU monitors injector currents and return signal from the injector driver to monitor a terminal voltage of PCM. 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 V
-
State of the engine
Running
Crankshaft position (CKP) sensor
Normal
Camshaft position (CMP) sensor
Normal
[ ]: HDS Parameter

Malfunction Threshold
Either of the conditions occurs at least 30 times (counts once per engine cycle):
Symptom: Injector current not flowing
The injector current is 0.2 A to 1 A or less*.
Symptom: Injector over current
The injector current is 12 A to 20 A or more*.
Symptom: PCM terminal (to injector) short to ground
The PCM terminal (to injector) voltage is 1 V to 1.3 V or less*.
Symptom: PCM terminal (to injector) short to power
The PCM terminal (to injector) voltage is 4.6 V to 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.
DTC: 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

DTC: 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

DTC: 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

DTC: 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.