Yale 520260-3 – Engine Control Module (ECM) / Engine ECU: Electronic Pressure Regulator (EPR) OORH (Out of Range High)

The Engine Control Module (ECM) is detecting a voltage or pressure signal from the Electronic Pressure Regulator (also known as the DEPR or MegaJector) that exceeds the allowable threshold.

• Yale and Hyster Forklifts
• 2005 and newer Yale (and Hyster) forklifts
• Yale Veracitor VX Series (GLC030-070VX, GLP050-070VX, GP050VX)
• PSI 2.0L/2.4L/4.3L engines
• Mazda 2.0L/2.2L engines
• Kubota WG2503 engines
• GM 4.3L LPG engines

1. 1

   Inspect the EPR/MegaJector electrical connector pins for damage, corrosion, or contamination, and ensure the connector is fully seated.

2. 2

   Inspect the wiring harness between the EPR and the ECM for open circuits, shorts to power/ground, or physical damage.

3. 3

   Check that the ECM grounds, battery cables, and ground straps are clean, tight, and secure to rule out erratic voltage.

4. 4

   Check for intake manifold vacuum leaks, which can cause higher-than-normal idle and skew pressure commands.

5. 5

   Perform an EPR pressure test by connecting a calibrated 0-10” water column (WC) vacuum gauge or manometer to the secondary pressure test port and comparing readings to OEM specs.

1. 1

   Depressurize and Disconnect

   Turn the manual LPG shut-off valve to the OFF position. Disconnect the negative battery cable to prevent electrical shock or system damage.

2. 2

   Remove Connections

   Disconnect the multi-pin electrical connector from the EPR.

3. 3

   Disconnect Fuel Lines

   Remove the fuel inlet line from the regulator.

4. 4

   Dismount the EPR

   Remove the nuts/bolts securing the EPR assembly to the upper and lower mounting brackets. Remove the old EPR.

5. 5

   Install the New EPR

   Mount the new EPR to the upper mounting bracket and secure it with bolts. Torque the bolts to 15 N·m (11 ft. lbs.).

6. 6

   Secure Lower Bracket

   Install the EPR assembly to the lower bracket and retain it with the nuts.

7. 7

   Reconnect Lines and Wiring

   Reconnect the fuel inlet line and torque to 27 N·m (20 ft. lbs.). Reconnect the EPR electrical connector.

8. 8

   Finalize

   Open the manual LPG valve and check for leaks. Reconnect the negative battery cable. Use a diagnostic scan tool or the dash display to clear the fault codes.