a depressing disco 2
#21
01-20-2013, 11:52 PM
I put your P1590 into http://enginecodemaster.com
Got:
Engine Code: p1590
Land Rover Engine Code: P1590 = ABS rough road signal circuit malfunction Hardware is OK, but SLABS ECU is sending an error signal.
Found this for you..
DTC P1590-P1592: ABS - ROUGH ROAD SIGNAL CIRCUIT MALFUNCTION
Description
When the vehicle travels across rough terrain, or on rough roads the ECM could falsely interpret suspension vibrations as a misfire and invoke engine misfire protocols and/or set a false DTC. The Self-Leveling and Anti-Lock Brake System (SLABS) ECU sends a rough road PWM signal to the ECM. Based on this rough road PWM signal, the ECM can suspend misfire detection for as long as the vehicle is travelling on a rough road.
Rough road signal input is measured at ECM 40-pin connector C0637 terminal No. 34 (Red/Green wire on Discovery; Yellow/Pink wire on Range Rover). The SLABS ECU rough road PWM signal varies in accordance with changing road conditions. The rough road PWM signal operates at a frequency of 2.10-2.56 Hz. ECM rough road control is based on specific changes to the PWM signal. If there is a rough road PWM signal failure the Hill Descent Control/Anti-Lock Braking System (HDC/ABS) warning light may be illuminated.
Diagnostic Aids
The rough road PWM signal can fail in the following ways:
Harness or connector damage.
SLABS wheel speed sensor failure.
If there is a rough road signal malfunction, the following DTCs may be set:
If DTC P1590 is set, there is an ABS rough road signal circuit malfunction. Hardware is okay, but the SLABS ECU is sending an error signal.
If DTC P1591 is set, there is a low ABS rough road signal circuit. Signal from SLABS ECU is shorted to ground.
If DTC P1592 is set, there is a high ABS rough road signal circuit. Signal from SLABS ECU shorted circuit to battery voltage.
Diagnosis & Repair
When ignition is turned on and during vehicle operation, ECM checks rough road signal circuits. If expected signal is not seen, ECM will store a DTC. Using an oscilloscope or Snap-On(R) PAC ensure SLABS ECU PWM signal indications are consistent with road conditions. See ROUGH ROAD PWM SIGNAL INDICATIONS table. If PWM signal is not as specified, check circuits for opens or shorts. Check for poor power and ground connections and/or loose wires at ECM. See WIRING DIAGRAMS article. Ensure ABS wheel speed sensors are operating properly. Repair as necessary. When DTC P1590-P1592 repairs are completed, perform REPAIR CONFIRMATION DRIVE CYCLE "A" .
ALSO -
make sure the little sensors on each wheel are close enough to the reluctor to get a signal.
On the discover I I can get under it and tap them out torward the hubs and get the ABS happy and fit.
Our D2 ABS has been good so far.
Got:
Engine Code: p1590
Land Rover Engine Code: P1590 = ABS rough road signal circuit malfunction Hardware is OK, but SLABS ECU is sending an error signal.
Found this for you..
DTC P1590-P1592: ABS - ROUGH ROAD SIGNAL CIRCUIT MALFUNCTION
Description
When the vehicle travels across rough terrain, or on rough roads the ECM could falsely interpret suspension vibrations as a misfire and invoke engine misfire protocols and/or set a false DTC. The Self-Leveling and Anti-Lock Brake System (SLABS) ECU sends a rough road PWM signal to the ECM. Based on this rough road PWM signal, the ECM can suspend misfire detection for as long as the vehicle is travelling on a rough road.
Rough road signal input is measured at ECM 40-pin connector C0637 terminal No. 34 (Red/Green wire on Discovery; Yellow/Pink wire on Range Rover). The SLABS ECU rough road PWM signal varies in accordance with changing road conditions. The rough road PWM signal operates at a frequency of 2.10-2.56 Hz. ECM rough road control is based on specific changes to the PWM signal. If there is a rough road PWM signal failure the Hill Descent Control/Anti-Lock Braking System (HDC/ABS) warning light may be illuminated.
Diagnostic Aids
The rough road PWM signal can fail in the following ways:
Harness or connector damage.
SLABS wheel speed sensor failure.
If there is a rough road signal malfunction, the following DTCs may be set:
If DTC P1590 is set, there is an ABS rough road signal circuit malfunction. Hardware is okay, but the SLABS ECU is sending an error signal.
If DTC P1591 is set, there is a low ABS rough road signal circuit. Signal from SLABS ECU is shorted to ground.
If DTC P1592 is set, there is a high ABS rough road signal circuit. Signal from SLABS ECU shorted circuit to battery voltage.
Diagnosis & Repair
When ignition is turned on and during vehicle operation, ECM checks rough road signal circuits. If expected signal is not seen, ECM will store a DTC. Using an oscilloscope or Snap-On(R) PAC ensure SLABS ECU PWM signal indications are consistent with road conditions. See ROUGH ROAD PWM SIGNAL INDICATIONS table. If PWM signal is not as specified, check circuits for opens or shorts. Check for poor power and ground connections and/or loose wires at ECM. See WIRING DIAGRAMS article. Ensure ABS wheel speed sensors are operating properly. Repair as necessary. When DTC P1590-P1592 repairs are completed, perform REPAIR CONFIRMATION DRIVE CYCLE "A" .
ALSO -
make sure the little sensors on each wheel are close enough to the reluctor to get a signal.
On the discover I I can get under it and tap them out torward the hubs and get the ABS happy and fit.
Our D2 ABS has been good so far.
#22
02-01-2013, 11:24 PM
Join Date: Jan 2013
Posts: 18
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So my status of my p1590 is gone! Replaced the hubs then cleared it with rsw abs amigo tool with help from "Disco Mike" when I was clearing it, everything is cleared but the P0308 came back looks like I'm gonna have to get those magnacor wires and e3 plugs that "Disco mike" rcommended me to get and hopefully it will correct the problem but I'm wondering if I should get the coil pack since i'm at it......thank u Disco mike for all the help so far.
