DTC 41

Diagnostic Chart: 1 Of 2:

Diagnostic Chart: 2 Of 2:

Ignition Signal Circuit:

CIRCUIT DESCRIPTION
The Engine Control Module (ECM) receives an ignition fail safe signal when the ignition switch is turned to the "Start" position. When the ECM receives this signal, it will toggle the igniter On and Off. As the igniter is toggled On and Off, so is the primary windings of the ignition coil, thus inducing a voltage into the secondary windings of the ignition coil. This induced voltage is then used to fire the spark plugs.

Diagnostic Trouble Code (DTC) 41 will set if the following condition is met: Toggled ignition fail safe signal not present at the ECM within 3 seconds of cranking.

DTC CHART TEST DESCRIPTION
Numbers below refer to circled numbers on the diagnostic chart.
(Part 1 0f 2)
1. This checks for power to the ignition coil.
2. This checks for a poor connection at the ignition coil, or for a faulty ignition coil.
3. This checks for an open or short to ground in BRN/WHT or BLK/WHT wires.
4. This checks for an open BLK/BLU wire, a poor ground connection or for a faulty noise suppressor filter.
(Part 2 0f 2)
5. This checks for an open or short to ground in the BRN wire, or for a faulty ECM.
6. This checks for a short to voltage in the BRN or BRN/WHT wire.
7. This checks for an open or short to ground in BRN/WHT wire.
8. This checks for an open in the BLK/BLU wire or a poor ground connection.
9. This checks to see if the ECM is toggling the ignition signal. Either an open, a short to ground, or a faulty ECM, or igniter is the fault.

DIAGNOSTIC AIDS
DTC 41 will set in history only.

INTERMITTENT MALFUNCTIONS
An intermittent malfunction may be caused by a poor connection, rubbed through wire insulation, or a wire broken inside the insulation. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals and poor terminal-to-wire connections before component replacement.