Notes On Intermittents

At key on, probe the ECM terminal D9 with a voltmeter to ground. Manipulate wiring and connectors while observing voltmeter. If voltage drops to zero (0) volts at key on/engine off, repair open or short to ground.

Fig 1: Code E178 - Power Steering Pressure Circuit

Fig 2: Code E178 - Power Steering Pressure Circuit (1 of 2)

Fig 3: Code E178 - Power Steering Pressure Circuit (2 of 2)

Fig 4: Schematic for Hard Trouble Code EI78