P1500

1GR-FE ENGINE CONTROL: SFI SYSTEM: P1500: AC Inverter Malfunction
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 a 115 V Alternating Current (AC). The voltage inverter can output a maximum of 400 W from an outlet.

When the 115 V AC 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 being driven, the ECM interprets this as a malfunction in the inverter circuit and stores the DTC.

WIRING DIAGRAM





INSPECTION PROCEDURE

Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1. CHECK FOR 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





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

B -- GO TO DTC CHART SFI System
A -- Continue to next step.

2. CHECK TERMINAL VOLTAGE (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 Voltage:





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

Text in Illustration





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

3. CHECK ECM (ELS2 VOLTAGE)





(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:





Text in Illustration





(d) Reconnect the voltage inverter connector.

NG -- CHECK HARNESS AND CONNECTOR (ECM - VOLTAGE INVERTER)

OK -- REPLACE VOLTAGE INVERTER ASSEMBLY Removal

4. CHECK HARNESS AND CONNECTOR (ECM - VOLTAGE INVERTER)

(a) Disconnect the voltage inverter connector.

(b) Disconnect the ECM connector.

(c) Turn the ignition to ON.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage (Check for Short in Idle-up Signal Circuit):





(e) Reconnect the voltage inverter connector and ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal