P1500

1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1500: AC Inverter Malfunction

DTC P1500 - AC Inverter Malfunction

DESCRIPTION

This vehicle is equipped with a voltage inverter, which supplies power to various electrical appliances. When the main switch of the voltage inverter is turned ON, the inverter relay turns ON, and the inverter then converts the 12 V Direct Current (DC) of the battery into an 115 V Alternating Current (AC). The voltage inverter can output a maximum of 400W from an outlet.
When the AC 115 V is output, a load is applied to the engine. The ECM controls the engine idling speed according to the vehicle speed and engine load. A speed signal is input to the inverter and an idle-up signal is transmitted to the ECM.









MONITOR DESCRIPTION

While the engine is idling, the ECM performs idle-up according to the power supply of the inverter to stabilize the engine idling speed.
When the vehicle is stationary and the inverter input exceeds 8.3 A, the inverter sends an idle-up signal from the OUT terminal of the inverter to the ELS2 terminal of the ECM.
If the idle-up signal is input into the ECM for 10 seconds while the vehicle is running, the ECM interprets this as a malfunction in the inverter circuit and sets the DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1500)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON and turn the Techstream on.
(c) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
(d) Read DTCs.

Result





HINT: If any DTCs other than P1500 are output, troubleshoot those DTCs first.

NG -- GO TO DTC CHART
OK -- Continue to next step.

2. INSPECT VOLTAGE INVERTER ASSEMBLY (SPD SIGNAL)




(a) Move the shift lever to N.
(b) Jack up the vehicle.
(c) Turn the ignition switch to ON.
(d) Measure the voltage according to the value(s) in the table below.
Standard:





HINT: The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. INSPECT ECM




(a) Disconnect the voltage inverter connector.
(b) Start the engine.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:





(d) Reconnect the inverter connector.
NG -- CHECK HARNESS AND CONNECTOR (ECM - INVERTER, INVERTER - POWER SOURCE)
OK -- REPLACE VOLTAGE INVERTER ASSEMBLY
4. CHECK HARNESS AND CONNECTOR (ECM - INVERTER, INVERTER - POWER SOURCE)




(a) Disconnect the voltage inverter connector.
(b) Disconnect the ECM connector.
(c) Turn the ignition switch to ON.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage (Check for Short in Idling Up Signal Circuit):





(e) Reconnect the inverter connector and the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM