This page describes the fuel system of the Honda PGM-Fi type fitted to Rover 827 and Honda Legend models. For an excellent fault finding guide to this ECU type go to Graham Wharton's Rover page.

FUEL SYSTEM

Crank Angle Sensor

Disconnect the crank angle sensor harness, and connect a multimeter to the U/G and U/Y wires at the T.DC. sensor There should he a resistance of 500 to 1,200 ohms, if not replace the sensor To test the CYL. sensor connect a multimeter to the W/U and the 0/U wire at the sensor, There should be a resistance of 500 to 1200 ohms, if not replace the sensor

Manifold absolute pressure sensor

Run the engine until the cooling Ian has operated once, then switch off. Switch on the ignition and connect a voltmeter to the W wire and the G wire at the vacuum control box (do not disconnect the plug), there should be approx. 3 volts, this will vary depending upon manifold pressure By removing vacuum hose 3 and applying vacuum to the sensor, the voltage from the MAP sensor on the W wire to the U wire at the ECU should drop, if not replace the MAP  sensor

Atmospheric pressure sensor

Run the engine until the coolirig fan has operated once, then switch off. Switth on~the ignition and connect the voltmeter to the R wire and the G/W wire at vacuum control box (do not disconnect the plug), there should be approx. 3 volts This voltage will vary depending upon the atmospheric pressura If not replace the atmospheric pressure sensor

Coolant temperature sensor

Run the engine until the cooling fan has operated once, then switch off. Disconnect the harness and connect the muttimeter to the two terminals on the coolant temperature sensor, the resistance measured between the two terminals should be 200 to 400 ohms. If not replace the sensor.

Air intake sensor

Run the the engine until the cooling fan has operated once, then switch off. Disconnect the harness and connect the multimeter to the two terminals on the air intake sensor, the resistance measured should be 1 to 4 ohms. If not replace the sensor.

Throttle angle sensor

With the ignition on and a voltmeter connected between the R/U wire and earth, 0.5 volt should be present at idle speed position, and 4 volts at full throttle position.

Exhaust gas recirculating lift valve

Switch on the ignition and connect a voltmeter to the Y/W wire and the G/W wire at the EGR lift valve (do not disconnect the plug). There should be approx. 5 volts. If not,. suspect faulty earth path or power supply. Connect a multimeter to the W/G and G/W wires (do not disconnect the plug). With the ignition on there should be approx. 1 volt, if not suspect a faulty E.S.R. unit or a short in the W/G wire to the E.C.U.

Exhaust gas recirculating control solenoid valve

Battery voltage is supplied by a LG/O wire from fuse 13 and a an earth path is supplied from a W wire at the vacuum control box, to the U/R wire at the ECU. With engine running and the 6 pin connector disconnected, apply battery voltage to the LG/O wire, and an earth path to the W wire. Approx. 8 in Hg of vacuum should be present, if not replace the exhaust gas recirculating control solenoid valve.

Idle mixture sensor

With the ignition switched off disconnect the vacuum control box 4 pin connector, and connect a multimeter at the idle mixture sensor harness to the Y/W wire and G/W wire, the resistance should be 4 to 6 ohms, if not replace the idle mixture sensor. If OK measure resistance between the Y/W and 0 wires, then the resistance between the 0 and the G/W wires, if the sum of the two checks does not equal 4 to 6 ohms, replace the idle mixture sensor.

Electronic idle control valve (EIC V)

With the ignition switched off disconnect the EICV. 2 pin connector and connect the multimeter to the 2 terminals on the EICV there should be 6 to 20 ohms, if not replace the EICV. If OK check continuity to body earth from each terminal, if continuity does not exist replace the EICV unit.

Inlectors

Injector coil resistance between the two terminals should be 1.5 to 2.5 ohms if incorrect the injector should be replaced.

Power resistors

Disconnect resistor harness connector, and check the resistance between each of the resistor terminals (B wires) and the power terminal (R wire) The resistance should be 5 to 7 ohms if not replace the power resistors.

Power steering oil pressure switch

Disconnect the two pin connector from the power steering oil pressure switch, connect a multirneter to the B and B/R wire at the switch harness With the engine running a continuity check should shows closed circuit if not replace the switch. With the engine running and steering wheel being turned from lock to lock an open circuit should exist if not replace the switch.

Pressure regulator solenoid valve

Disconnect the 6 pin connector and supply a battery feed to the solenoid valve. By supplying a earth path to the LG wire the solenoid should give an audible click, if not replace the solenoid valve