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The Terminator
Engine/Tuning
Engine dies, code 1233
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<blockquote data-quote="Vinnie_B" data-source="post: 16733393" data-attributes="member: 201678"><p><strong>P1233 - Fuel System Disabled or Offline</strong></p><p></p><ul> <li data-xf-list-type="ul">The PCM monitors the fuel pump monitor (FPM) circuit from the fuel pump driver module (FPDM). With the key on, the FPDM continuously sends a duty cycle signal to the PCM through the FPM circuit. The test fails if the PCM stops receiving the duty cycle signal.</li> </ul><p>POSSIBLE CAUSES:</p><p></p><ul> <li data-xf-list-type="ul">Inertia fuel shutoff (IFS) switch needs to be reset</li> <li data-xf-list-type="ul">Open FPDM ground circuit</li> <li data-xf-list-type="ul">Open circuit to FPDM PWR RLY</li> <li data-xf-list-type="ul">Open FPDM PWR circuit</li> <li data-xf-list-type="ul">Open or shorted FPM circuit (engine should start)</li> <li data-xf-list-type="ul">Damaged IFS switch</li> <li data-xf-list-type="ul">Damaged FPDM PWR RLY</li> <li data-xf-list-type="ul">Damaged FPDM</li> <li data-xf-list-type="ul">Damaged PCM</li> <li data-xf-list-type="ul">Also for Mustang:</li> <li data-xf-list-type="ul">Open B+ circuit to the constant control relay module (CCRM) pin 11</li> <li data-xf-list-type="ul">Open ground to CCRM pin 18</li> <li data-xf-list-type="ul">Damaged CCRM</li> </ul><p>Diagnostic Aids</p><p></p><p>The PCM expects to see one of the following duty cycle signals from the FPDM on the FPM circuit: <strong>1)</strong> 50% (500 ms on, 500 ms off), all OK. <strong> 2) </strong>25% (250 ms on, 750 ms off), FPDM did not receive a fuel pump (FP) duty cycle command from the PCM, or the duty cycle that was received was invalid. <strong>3)</strong> 75% (750 ms ON, 250 OFF), the FPDM has detected a fault in the circuits between the FPDM and the fuel pump.</p></blockquote><p></p>
[QUOTE="Vinnie_B, post: 16733393, member: 201678"] [B]P1233 - Fuel System Disabled or Offline[/B] [LIST] [*]The PCM monitors the fuel pump monitor (FPM) circuit from the fuel pump driver module (FPDM). With the key on, the FPDM continuously sends a duty cycle signal to the PCM through the FPM circuit. The test fails if the PCM stops receiving the duty cycle signal. [/LIST] POSSIBLE CAUSES: [LIST] [*]Inertia fuel shutoff (IFS) switch needs to be reset [*]Open FPDM ground circuit [*]Open circuit to FPDM PWR RLY [*]Open FPDM PWR circuit [*]Open or shorted FPM circuit (engine should start) [*]Damaged IFS switch [*]Damaged FPDM PWR RLY [*]Damaged FPDM [*]Damaged PCM [*]Also for Mustang: [*]Open B+ circuit to the constant control relay module (CCRM) pin 11 [*]Open ground to CCRM pin 18 [*]Damaged CCRM [/LIST] Diagnostic Aids The PCM expects to see one of the following duty cycle signals from the FPDM on the FPM circuit: [B]1)[/B] 50% (500 ms on, 500 ms off), all OK. [B] 2) [/B]25% (250 ms on, 750 ms off), FPDM did not receive a fuel pump (FP) duty cycle command from the PCM, or the duty cycle that was received was invalid. [B]3)[/B] 75% (750 ms ON, 250 OFF), the FPDM has detected a fault in the circuits between the FPDM and the fuel pump. [/QUOTE]
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Engine dies, code 1233
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