Another code ... P1494, RATS !

OK, got another code. This time it's the P1494. The P0455 is gone and I didn't find any leaks via a visual inspection nor the service garage with the smoke tester.

So, P1494 is now the game to play on today. Ever since this code came, the cold engine idle tends to rev up and down continually. It can drive a person ...

This is the best info I can find at this time to get things corrected.

P1494 is a Leak Detection Pump Switch or Mechanical Fault.


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TSB-18-01-00

SUBJECT:
Misdiagnosed Leak Detection Pump Systems With DTC P1494, P0442, P0455, OR P0456.

MODELS:
1997 - 2000 (AB) Ram Van
1997 - 2000 (AN) Dakota
1997 - 2000 (BR/BE) Ram truck
1998 - 2000 (DN) Durango
1997 - 2000 (FJ) Avenger/Sebring/Talon
1997 - 2000 (JA) Cirrus/Stratus/Breeze
1997 - 2000 (JX) Sebring Convertible
1997 - 2000 (LH) Concorde/Intrepid/LHS/300M/Vision
1997 - 2000 (NS) Town & Country/Caravan/Voyager
1997 - 2000 (PL) Neon
1997 - 2000 (PR) Prowler
1997 - 2000 (SR) Viper/Viper GTS
1997 - 2000 (TJ) Wrangler
1999 - 2000 (WJ) Grand Cherokee
1997 - 2000 (XJ) Cherokee
1997 - 1998 (ZJ) Grand Cherokee

DISCUSSION:
During evaporative system diagnosis, Leak Detection Pumps have mistakenly been replaced. A thorough inspection for pinched, kinked, or disconnected supply vacuum lines (as currently listed in the Powertrain Diagnostic Procedures) is a critical step in diagnosing DTC P1494 (LDP SW OR MECHANICAL FAULT). Additionally, the other evaporative leak faults (DTC P0442 - SMALL LEAK, P0455 - LARGE LEAK, and P0456 - VERY SMALL
LEAK) should have the supply vacuum lines examined for pinches or kinks prior to any LDP component replacement. The supply vacuum lines should be checked from the engine compartment all the way to the fuel tank, including the LDP and purge system.

NOTE: VERIFY ALL RELATED SUPPLY VACUUM LINE ROUTINGS FOR
PINCHES, KINKS, OR DISCONNECTION'S BEFORE REPLACING LDP
SYSTEM COMPONENTS.

POLICY: Information Only

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