I am getting code P1602, Power Supply (B+) Terminal 30 Low Voltage. The engine is running rough, idle bounces between 600 and 1000 rpm's, rev's on its own to about 2000 rpm's and back to 600 to 1000rpm's. If I use the accelerator, it is hesitant to rev up and acts like it is trying to clear the problem if I back off of the accelerator and then re-accelerate. I have checked the voltage at the battery, the fuse block and the ECU and all three are reading 12.31 volts. All fuses are good. I am at a stand still. Any advise would be greatly appreciated.
Thank you, Chris Hansen
I have a 98 passat 4cyl turbo and my oil light and now engine light is on. Took it to checkers for a diagnosis and they couldnt read the computer. Just passed emissions 4 days ago and they had to try 3 times to read the computer. What are some reasons this might be going on?
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Re: OBD II code P1602 on '98 VW Passat 1.8L B5
I assume you have removed and cleaned the battery terminals and connections - and the earthing connections while you were at it?
The best way forward is to get the fault codes read using the on-board diagnostic system. You can either get this done at a suitably equipped garage or do it yourself with free "VAG diagnostic software" - (just google it), a £15 interface cable and the use of a laptop computer. This should indicate where the
fault lies. If a sensor is throwing a fault code, it could still be just a dirty electrical connector on the end of the cable, and not the sensor itself. Once you have the list of fault codes, get them cleared, run the car for a few miles (or minutes if you don't want to go on the road) and check the codes again in case some of them were old ones that no longer apply. If you get back to me with the list I will try to help you further. Cheers, D.
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Diagnostic Trouble Code Storage Condition Remedy P0100 Mass Air Flow Sensor Voltage High C-8 P0100 Mass Air Flow Sensor Voltage Low C-8 P0110 Intake Air Temperature Voltage High C-10 P0110 Intake Air Temperature Voltage Low C-10 P0115 Coolant Temperature Voltage High C-9 P0115 Coolant Temperature Voltage Low C-9 P0120 Throttle Position Sensor (TPS) Voltage High C-7 P0120 Throttle Position Sensor (TPS) Voltage Low C-7 P0130 O2 Sensor 1 Circuit Voltage High C-30 P0130 O2 Sensor 1 Circuit Voltage Low C-30 P0130 O2 Sensor 1 Open Circuit C-30 P0150 O2 Sensor 2 Circuit Voltage High C-31 P0150 O2 Sensor 2 Circuit Voltage Low C-31 P0150 O2 Sensor 2 Open Circuit C-31 P0201 Injector Valve 1 Voltage High C-20 P0201 Injector Valve 1 Voltage Low C-20 P0201 Injector Valve 1 Open Circuit C-20 P0202 Injector Valve 2 Voltage High C-21 P0202 Injector Valve 2 Voltage Low C-21 P0202 Injector Valve 2 Open Circuit C-21 P0203 Injector Valve 3 Voltage High C-22 P0203 Injector Valve 3 Voltage Low C-22 P0203 Injector Valve 3 Open Circuit C-22 P0204 Injector Valve 4 Voltage High C-23 P0204 Injector Valve 4 Voltage Low C-23 P0204 Injector Valve 4 Open Circuit C-23 P0205 Injector Valve 5 Voltage High C-24 P0205 Injector Valve 5 Voltage Low C-24 P0205 Injector Valve 5 Open Circuit C-24 P0206 Injector Valve 6 Voltage High C-25 P0206 Injector Valve 6 Voltage Low C-25 P0206 Injector Valve 6 Open Circuit C-25 P0230 Fuel Pump Relay Voltage High C-6 P0230 Fuel Pump Relay Voltage Low C-6 P0230 Fuel Pump Relay Open Circuit C-6 P0325 Knock Signal Circuit 1 C-26 P0330 Knock Signal Circuit 2 C-26 P0335 No Engine RPM Signal C-32 P0335 Incorrect RPM Signal C-32 P0340 Hall Sensor Voltage High C-15 P0340 Hall Sensor Voltage Low C-15 P0403 EGR Valve Voltage High C-28 P0403 EGR Valve Voltage Low C-28 P0403 EGR Valve Open Circuit C-28 P0410 Secondary Air Pump Voltage High C-27 P0410 Secondary Air Pump Voltage Low C-27 P0443 Fuel Tank Ventilation Valve Voltage High C-29 P0443 Fuel Tank Ventilation Valve Voltage Low C-29 P0443 Fuel Tank Ventilation Open Circuit C-29 P0500 Vehicle Speed Signal C-42 P0505 Idle Air Control Voltage High C-33 P0505 Idle Air Control Voltage Low C-33 P0550 Power Steering Voltage High C-14 P0550 Power Steering Voltage Low C-14 P0560 Battery Voltage High C-4 P0560 Battery Voltage Low C-4 P0602 Control Module Programming Error C-2 P1110 Intake Manifold Valve 1 Voltage High C-34 P1110 Intake Manifold Valve 1 Voltage Low C-34 P1111 Intake Manifold Valve 2 Voltage High C-35 P1111 Intake Manifold Valve 2 Voltage Low C-35 P1230 Power Supply Relay Secondary Circuit C-3 P1405 EGR Valve Feedb. Voltage High C-28 P1405 EGR Valve Feedb. Voltage Low C-28 P1405 EGR Valve Feedb. Incorrect Signal C-28 P1501 Immobiliser No or Wrong Coding C-5 P1502 Immobiliser No Signal C-5 P1503 Immobiliser Wrong Signal C-5 P1530 A/C Relay Voltage High C-41 P1530 A/C Relay Voltage Low C-41 P1600 Reprogram or Replace Electronic Control Unit (ECU) C-2 P1602 Knock Control Module; Replace ECU C-2 P1690 Check Light Voltage High C-43 P1690 Check Light Voltage Low C-43 P1690 Check Light Open Circuit C-43 P1740 Torque Control Voltage Low C-40 P1740 Continuous Torque Control C-40
first of all a flashing check engine light indicates STOP as soon as possible SAFELY.. as for if you continue to drive damage to catalytic converter may occur. Have you had codes pulled yet ? start there the codes wont tell you wrong exactly but will give you problem area to start checking out. check for data link connection. make sure it can communicate with scan tool. commonly on fords is the ecm fuse is in same power supply line as cigarette lighter.( you figure Huh.) if fuse is blown it affects ecm power supply and causes drivability issues. and fuse is labled cigarette lighter fuse and Not ECM power supply. hope this helps if not pull codes and repost more info i get the more i can help . good luck
The throttle position sensor has an idle switch in it that tells the car's computer that the throttle is positioned at idle. If the idle switch sticks in the idle position, the computer will not allow the engine to rev more than 2500 rpm. In your case, I think the switch is stuck.
First, see if you can get the trouble codes to come up. Rig a jumper wire and jump between the "T" terminal and the "E1" terminal in the car's "Diagnostics" box. It is a small black box on the driver's side of the engine compartment near the battery. Open the lid and on the inside of the lid it has a map of the terminals.
Once you hook up the jumper wire, turn the ignition switch to on but do not start the car. If there are codes, the check engine light (orange) will blink the 2 digit code. It blinks the first digit, pauses, then blinks the second digit. The code for the throttle position sensor is code "41". That is, four blinks...pause...then one blink. If this code comes up, change the throttle position sensor. (If there are no codes, the check engine light will steadily blink once per second until you turn the key to off.) Don't forget to remove the jumper wire when you are finished.
code 16 is described as follows
rpm too low during self-test (lean fuel test)
idle speed control (ISC)
rpm out of self test specification
electronic distributorless ignition fault refers to a signal not recieved
exhaust gas oxygen sensor - signal voltage indicates rich during engine run self test
What i would check is the egr valve to see if it is stuck open. that would make it run like ****.
Does it idle ok or does it run rough. I mean without revving it with the pedal? Have also seen these melt exhaust valves.
So check that and let me know what you find.