PINPOINT TEST G258127p32

Pinpoint Tests

PINPOINT TEST G258127p32 : DTC P1606; EMS CONTROL RELAY MALFUNCTION

G258127t149 : CHECK THE EMS RELAY PERMANENT B+ SUPPLY
1. Remove the EMS relay.
2. Measure the voltage between the relay base, pins 02 and 03 and GROUND.

- Are both voltages greater than 10 volts?

->YES
GO to Pinpoint Test G258127t151.

->NO
REPAIR the circuit between the relay base and battery. This circuit includes the high power protection module. CLEAR the DTC. TEST the system for normal operation.

G258127t150 : CHECK THE EMS RELAY TO ECM CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the battery negative terminal.
2. Disconnect the ECM electrical connector, PI01.
3. Measure the resistance between the relay base, pin 05 and PI01, pins 23 (WR) and 24 (WR).

- Is either resistance greater than 5 Ohms?

->YES
REPAIR the high resistance circuit. CLEAR the DTC. TEST the system for normal operation.

->NO
GO to Pinpoint Test G258127t151.

G258127t151 : CHECK THE ECM TO EMS RELAY CONTROL CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the battery negative terminal.
2. Disconnect the ECM electrical connector, PI01.
3. Measure the resistance between the relay base, pin 01 and PI01, pin 40 (U).

- Is the resistance greater than 5 Ohms?

->YES
REPAIR the high resistance circuit. CLEAR the DTC. TEST the system for normal operation.

->NO
INSTALL a new EMS relay. CLEAR the DTC. TEST the system for normal operation.