DTC P0201: Injector Circuit - Cylinder 1, DTC P0202: Injector Circuit - Cylinder 2, DTC P0203: Injector Circuit - Cylinder 3, DTC P0204: Injector Circuit - Cylinder 4

CIRCUIT OPERATION
• The injector power is supplied from the MFI relay (terminal No. 4).
• The ECM <M/T> or PCM <A/T> controls the injector by turning the power transistor in the ECM <M/T> or PCM <A/T> "ON" and "OFF".
TECHNICAL DESCRIPTION
• The amount of fuel injected by the injector is controlled by the amount of continuity time the coil is grounded by the ECM <M/T> or PCM <A/T>.
• A surge voltage is generated when the injectors are driven and the current flowing to the injector coil is shut off.
• The ECM <M/T> or PCM <A/T> checks this surge voltage.
DESCRIPTIONS OF MONITOR METHODS
• If a surge current is not generated in the coil after the injector has been actuated, an open or short circuit is determined to have occurred.
MONITOR EXECUTION
Continuous
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
• Not applicable

Sensor (The sensor below is determined to be normal)
• Not applicable
DTC SET CONDITIONS Logic Flow Chart


Check Condition
Engine is running.

Judgment Criterion
• Injector coil surge voltage (battery positive voltage +2 volts) has not been detected for two seconds.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 19 .
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:
• Injector failed.
• Open or shorted injector circuit, or connector damage.
• ECM failed. <M/T>
• PCM failed. <A/T>