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jeepmopar76
jeepmopar76, Jeep/Chrysler Triple Master Tech
Category: Jeep
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Experience:  32yr ASE Master Tech, 9yr Chrysler Master Tech, 19 yr Jeep Dealership service including AMC/Eagle
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a p1494 code what exactly is and where is the part located

Customer Question

a p1494 code what exactly is and where is the part located on a 03 jeep grand cherokee laredo
Submitted: 5 years ago.
Category: Jeep
Expert:  jeepmopar76 replied 5 years ago.

Here is the flow chart starting point for this code; it may just be a vacuum line to the LDP, or other possible causes, listed; the LDP itself, is not cheap, so a complete diag. should be preformed , before throwing parts at it. I will also include a pic of the location, at the end, so you can at least check for vacuum.

Symptom:

P1494-LEAK DETECTION PUMP SW OR MECHANICAL FAULT

When Monitored and Set Condition:

P1494-LEAK DETECTION PUMP SW OR MECHANICAL FAULT

When Monitored: Immediately after a cold start, with battery/ambient temperature

between 40 deg. F and 90 deg. F and coolant temperature within 10 deg. F of battery/

ambient.

Set Condition: The state of the switch does not change when the solenoid is energized.

POSSIBLE CAUSES

VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION

LDP SWITCH SENSE CIRCUIT SHORTED TO GROUND

WIRING HARNESS INTERMITTENT

LDP VACUUM SUPPLY

FAULTY LEAK DETECTION PUMP

LDP SWITCH SENSE CIRCUIT OPEN

POWERTRAIN CONTROL MODULE

TEST ACTION APPLICABILITY

1 Start by reading PCM DTC(s) and record the related Freeze Frame data if any

DTC(s) are present.

Check the vehicle repair history.

If the vehicle has a repair history that pertains to the customer's current complaint,

review the repair.

NOTE: Replacing the PCM will not correct this problem.

Inspect the vehicle for any aftermarket accessories that may have been installed

incorrectly.

Check for any service bulletin(s) related to the customer's complaint or DTC(s).

If a service bulletin applies, follow the instructions per service bulletin.

Did the service bulletin repair the customer's complaint?

All

Yes ! Testing Complete.

Perform POWERTRAIN VERIFICATION TEST VER - 6.

No ! Go To 2

2 Ignition on, engine not running.

With the DRBIIIt, read DTCs and record the related Freeze Frame data.

Is the DTC Good Trip Counter displayed and equal to zero for P-1494?

All

Yes ! Go To 3

No ! Go To 8

REMOVAL

The Leak Detection Pump (LDP) is located under the left quarter panel behind the left/rear wheel (LOCATION, LDP / EVAP CANISTER). It is attached to a two-piece support bracket (TWO-PIECE SUPPORT BRACKET). The LDP and LDP filter are replaced (serviced) as one unit.

  1. Remove stone shield behind left/rear wheel (STONE SHIELD). Drill out plastic rivets for removal.
  2. Remove 3 LDP mounting bolts (LDP MOUNTING BOLTS).
  3. Remove support bracket brace bolt (TWO-PIECE SUPPORT BRACKET).
  4. Loosen, but do not remove 2 support bracket nuts at frame rail (LDP MOUNTING BOLTS).
  5. To separate and lower front section of two-piece support bracket, remove 3 attaching bolts on bottom of support bracket (TWO-PIECE SUPPORT BRACKET). While lowering support bracket, disconnect LDP wiring clip (LDP REMOVAL / INSTALLATION).
  6. Disconnect electrical connector at LDP (LDP REMOVAL / INSTALLATION).
  7. Carefully remove vapor/vacuum lines at LDP (LDP REMOVAL / INSTALLATION).
  8. Remove LDP.

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