Ford Falcon AUII Fault Code P1358

22-May-2012
p1358 Fault Code Ford Falcon

P1358 Ignition System Diagnostic Monitor, all signs point to a faulty PCM, but how can you be sure.

AUII ford Falcon Ute, below symptoms

  • No Start
    • No Spark
    • No Injector Pulse
    • Craking
  • Engine Check Light on
  • Falut Code P1358 -Ignition System Diagnostic Monotor
    • Hard Code (resets straight away with key on engine off)
    • No other fualt codes present in other systems



After referring to some technical information, it was learned that the fault relates to the PCM's monitoring of the voltage from the 3 ignition coils.

The ignition coils are supplied 12 volts at key on, the 3 coil winding earths are then switched by the PCM

To start we can rule in the below possible faults

  • Ignition Coil
  • Wiring to the coil
  • Wiring from the coil to the PCM
  • PCM
  • Power supply or earths at PCM


AUII Ford Falcon ECM Location

PCM location

Passanger side kick panel




Testing Ignition Coils

AUII Ford Falcon Ignition Coil Pinout
  • 4 terminal plug
    • Pin 1 : Cylinders 1 & 6 to PCM pin #26
    • Pin 2 : Cylinders 2 & 5 to PCM pin #52
    • Pin 3 : Cylinders 3 & 4 to PCM pin #78
    • System voltage from ignition

Using the LoadPro dynamic test leads and our 590 multimeter, measuring each terminal under load (with ignition on) and getting system voltage, we can eliminate any potential wiring (to the coil) and coil faults. These test results mean we have eliminated the coils and power supply out of our list of possibilities, If we had not had system voltage under load we can determine that the issue may be within that circuit

  • Ignition Coil
  • Wiring to the coil
  • Wiring from the coil to the PCM
  • PCM
  • Power supply or earths at PCM

  • TMX-589 TMX Meter Kit

    Tech Meter Kit

    $376.20 $488.99
    Sale new-product TMX-589 - Professional Grade True RMS Digital Mulitmeter - CATIII 1000V safety rating - Safe for use on Hybrids - Waterproof to IP67 Standards LOADpro - Loads the circuit to find corrosion and resistance in the wiring - fast diagnosis - OEM approved tool - patented method can't be accomplished by Power Probe FET Book - 200 pgs of Fundamental Elecrical Troubleshooting tips and insight A must have for any technician beginning or advanced Training DVD - One hour of multimeter training and advice on many aspects of electrical troubleshooting by Dan Sullivan - leading electrical trainer Compass - Used for Alternator and solenoid diagnostics
  • 180 LoadPro Dynamic Test Leads

    LoadPro Dynamic Test Leads

    $99.34 $113.82
    Sale featured-product LoadPro test leads plug into you digital multimeter to check the voltage. By loading the circuit making a voltage drop test you can quickly determine what the problems is. watch our training video for guidance.
  • 590 Professional Automotive Meter

    Professional Automotive Meter

    $156.20 $211.13
    Sale Tests the on time of fuel injectors using the MS pulse width test function, RPM pick-up, Temperature probe, has two sets of leads. The unit is auto ranging has 48 test ranges, 15 test functions and comes with its own carrying case.


FOr Falcon AUII ECM pins for testing p1358

Testing PCM and wiring

  • Pin 26 : Cylinders 1 & 6
  • Pin 52 : Cylinders 2 & 5
  • Pin 78 : Cylinders 3 & 4

Again using the LoadPro dynamic test leads and our 590 multimeter, performing Load Tests, with the key on and engine off, we expect to see system voltage under load. Reading system voltage under load at these terminals means we can rule out the wiring from the coils to the ECU

  • Ignition Coil
  • Wiring to the coil
  • Wiring from the coil to the PCM
  • PCM
  • Power supply or earths at PCM

All that is left to rule in the PCM -Normally a coil driver fault, is to eliminate the PCM power supplies and earths, Once again with the LoadPro dynamic test leads and 590 multimeter, measuring Voltage, we are looking for 0 volts on the earths and system voltage on power supplies on the below terminals

  • Earth Pin Numbers (0 volts)
    • 76
    • 77
    • 51
    • 25
    • 24
  • Power Supply Pin Numbers (System voltage under load)
    • 71
    • 55

Getting 0 volts on all earths and system voltage on all power supplies allows us to point the finger directly at the PCM


  • TMX-589 TMX Meter Kit

    Tech Meter Kit

    $376.20 $488.99
    Sale new-product TMX-589 - Professional Grade True RMS Digital Mulitmeter - CATIII 1000V safety rating - Safe for use on Hybrids - Waterproof to IP67 Standards LOADpro - Loads the circuit to find corrosion and resistance in the wiring - fast diagnosis - OEM approved tool - patented method can't be accomplished by Power Probe FET Book - 200 pgs of Fundamental Elecrical Troubleshooting tips and insight A must have for any technician beginning or advanced Training DVD - One hour of multimeter training and advice on many aspects of electrical troubleshooting by Dan Sullivan - leading electrical trainer Compass - Used for Alternator and solenoid diagnostics
  • 180 LoadPro Dynamic Test Leads

    LoadPro Dynamic Test Leads

    $99.34 $113.82
    Sale featured-product LoadPro test leads plug into you digital multimeter to check the voltage. By loading the circuit making a voltage drop test you can quickly determine what the problems is. watch our training video for guidance.
  • 590 Professional Automotive Meter

    Professional Automotive Meter

    $156.20 $211.13
    Sale Tests the on time of fuel injectors using the MS pulse width test function, RPM pick-up, Temperature probe, has two sets of leads. The unit is auto ranging has 48 test ranges, 15 test functions and comes with its own carrying case.

Comment

No Very




Captcha Image