89 merc sable ecm stuck with open circuit,short battery and buzzs

Have it checked for DTC'S -diagnostic trouble codes . That will tell you what's up . Dealer or someother qualified repair shop .
DTC P0532: Air Conditioning A/C Refrigerant Pressure Sensor Circuit Low Voltage
DTC P0533: Air Conditioning A/C Refrigerant Pressure Sensor Circuit High Voltage
DTC P0645: A/C Clutch Relay Control Circuit
Circuit System Description
When the A/C switch is pressed, the HVAC control module sends a serial data message to the ECM. This input will request the engine control module (ECM) to ground the A/C compressor clutch relay control circuit, which will switch the A/C CMPRSR CLUTCH relay on. With the relay contacts closed, battery voltage is supplied to the A/C compressor clutch assembly.

DTC B0228 02 : Recirculate Position Feedback Circuit Short to Ground
DTC B0228 05 : Recirculate Position Feedback Circuit Short to Battery or Open
DTC B0228 61 : Recirculate Position Circuit Actuator Stuck
DTC B0413 02 : Temperature Control 1 Feedback Circuit Short to Ground
DTC B0413 05 : Temperature Control 1 Feedback Circuit Short to Battery or Open
DTC B0413 61 : Temperature Control 1 Feedback Circuit Actuator Stuck Open
DTC B0423 02 : Temperature Control 2 Feedback Circuit Short to Ground
DTC B0423 05 : Temperature Control 2 Feedback Circuit Short to Battery or Open
DTC B0423 61 : Temperature Control 2 Circuit Actuator Stuck

Flashing Diag Code P0122
TP circuit low input
DETECTION CONDITION
• If PCM detects TP sensor voltage at PCM terminal 89 below 0.10 V after engine start, PCM determines
that TP circuit has a malfunction.
POSSIBLE CAUSE
• TP sensor malfunction
• Connector or terminal malfunction
• Open circuit between TP sensor terminal C and PCM terminal 89
• Short to ground circuit between TP sensor terminal C and PCM terminal 89
• Open circuit between TP sensor terminal A and PCM terminal 90
• Short to ground circuit between TP sensor terminal A and PCM terminal 90
• PCM malfunction

Flashing Diag Code P0123
TP circuit high input
DETECTION CONDITION
• If PCM detects TP sensor voltage at PCM terminal 89 is above 4.77 V after engine start, PCM determines
that TP circuit has a malfunction.
POSSIBLE CAUSE
• TP sensor malfunction
• Connector or terminal malfunction
• Open circuit between TP sensor terminal B and PCM terminal 91
• Short to reference voltage (Vref) supply circuit between TP sensor terminal C and PCM terminal 89
• PCM malfunction

Bottom radiator hose is sufficient.

94+ AIR BAG DIAGNOSTIC TROUBLE CODES/CLEARING
Code Component/Fault Description

No Air Bag Indicator - Inoperative Indicator Circuit
Continuous Air Bag Indicator - Diagnostic Trouble Code Timed Out, Diagnostic Monitor Disconnected or Inoperative, or No Ignition Voltage to Diagnostic Monitor.
12 Lost Battery Feed
13 Air Bag Circuit Shorted to Ground
14 Primary Crash Sensor Circuit Shorted to Ground
21 Diagnostic Monitor Not Mounted to Vehicle Properly
22 Safing Sensor Output Circuit Shorted to Battery Voltage
23 Memory Clear Circuit Improperly Grounded
24 System Disarm Failure or Internal Diagnostic Monitor Fault
32 Driver Side Air Bag Circuit High Resistance or Open
33 Passenger Side Air Bag Circuit High Resistance or Open
34 Driver Side Air Bag Circuit Low Resistance or Shorted
35 Passenger Side Air Bag Circuit Low Resistance or Shorted
41 RH Radiator Primary Crash Sensor Feed/Return Circuit Open
42 LH Radiator Primary Crash Sensor Feed/Return Circuit Open
44 RH Radiator Primary Crash Sensor Not Mounted to Vehicle Properly
45 LH Radiator Primary Crash Sensor Not Mounted to Vehicle Properly
52 Intermittent or Repaired Lost Battery Feed
53 Intermittent or Repaired Air Bag Circuit Shorted to Ground
54 Intermittent or Repaired Primary Crash Sensor Circuit Shorted to Ground
61 Intermittent or Repaired Diagnostic Monitor Not Mounted to Vehicle Properly
62 Intermittent or Repaired Safing Sensor Output Circuit Shorted to Battery Voltage
63 Intermittent or Repaired Memory Clear Circuit Improperly Grounded
64 Intermittent or Repaired System Disarm Failure or Internal Diagnostic Monitor Fault
72 Intermittent or Repaired Driver Side Air Bag Circuit High Resistance or Open
73 Intermittent or Repaired Passenger Side Air Bag Circuit High Resistance or Open
74 Intermittent or Repaired Driver Side Air Bag Circuit Low Resistance or Shorted
75 Intermittent or Repaired Passenger Side Air Bag Circuit Low Resistance or Shorted
81 Intermittent or Repaired RH Radiator Primary Crash Sensor Feed/Return Circuit Open
82 Intermittent or Repaired LH Radiator Primary Crash Sensor Feed/Return Circuit Open
84 Intermittent or Repaired RH Radiator Primary Crash Sensor Not Mounted to Vehicle
85 Intermittent or Repaired LH Radiator Primary Crash Sensor Not Mounted to Vehicle
Rapid Continuous Flashing of Air Bag Indicator (No Diagnostic Trouble Code) Both Primary Crash Sensors Disconnected Assembly Plant Mode

TROUBLE CODE CLEARING

1. Follow the diagnostic procedures to service the fault condition flashing on the air bag indicator prior to code clearing.

2. Cycle the ignition switch to OFF and then to RUN.

3. Observe air bag indicator prove-out (six ? two seconds) followed by diagnostic trouble code (52-85) flashing completely one time.

4. Locate the Diagnostic "Trouble Code Clear" Connector (grey connector). located underneath the glove compartment, left side (06010) containing Circuits 631 (T/R) and 57 (BK).

5. Use a jumper wire to short Circuit 631 (T/R) to Circuit 57 (BK) or to another good ground. This short must be made after the diagnostic trouble code flashes completely one time, but before the warning light stays on continuously.

6. Hold short until air bag diagnostic monitor tone sounds (approximately five seconds).

7. Release short on Circuit 631 (T/R) to Circuit 57 (BK). This short must be released within 25 seconds after the diagnostic monitor tone sounds.

Diagnostic trouble code is now cleared from memory. Next highest priority diagnostic trouble code stored (if one exists) will begin flashing.

The codes and clearing proceedure above are to be used as a guide, NO claims are implied as to the correctness or accuracy of either.

Hello www_ropesmor,

This code P0123 is Throttle position sensor circuit high input.

There four basic reasons for this code.

1. An open or short to ground between the TPS (throttle position sensor) and the ECM (Engine control module).
2. A short to battery voltage between TPS and the ECM.
3. A short between the TPS wires.
4. A faulty TPS.

See below for connector diagrams.

First, with scan tool monitor TPS with throttle closed voltage should be
I f you don't have a scan tool, back probe terminal 1with a volt meter to ground and you will see the voltage as outlined above otherwise follow the steps below.


1.Check to see if there is about 5 volts at the TPS; with engine off key on disconnect the TPS back probe the harness side terminal 3 to ground with a volt meter if there is about 5 volts go to step 2 if about 5 volts if not repair the 5 volt circuit.

2. Probe the harness side terminal 2 to chassis ground with a volt meter, if voltage above .02 repair circuit 2 short to voltage. If voltage is .02 volts or below go to step 3.

3. Probe the harness side terminal 1 to ground with volt meter if below .5 volts go to step 4 if not repair short to battery between TSP harness and ECM connector

4 Turn the ignition off and disconnect the ECM connector . With an ohm meter measure the resistance between the ECM (terminal C18) and TPS ground circuit it should be below 1 ohm. Measure the resistance between the ECM (terminal C8) and TPS signal circuit it should be below 1 ohm. If not repair the open circuit.

After faulty circuit is found and repaired clear code and verify repair.







I hope this helps.

Regards,

netvan

Hello jhonney21,

The P1491 is Radiator fan control relay circuit code. It is set if an open or short circuit is detected in the radiator fan relay control circuit.

Regards,
netvan

its normal.... it maybe coolant is going down the pipes or ECM finishes its job

locate drain plug on bottom of radiator and drain coolant then flush with water till clean. close drain and refill will Peak green 50/50 fluid

i am glad to have helped you and also that it was under warranty please rate my answer thanks !

Yes, it's called a lamp fault code.

9 is not familiar to me. Call dealer service department and ask them what code means.

Here are codes for a 94 Aerostar. I don't have 91 Sable. Sorry.



Air Bag Diagnostic Monitor Diagnostic Trouble Code Priority Table Diagnostic Trouble Code Component/Fault Description — No Air Bag Indicator — Inoperative Indicator Circuit or No Battery Positive Voltage to Air Bag Diagnostic Monitor — Continuous Air Bag Indicator — Air Bag Diagnostic Monitor Disconnected or Inoperative 12 Low Battery Voltage 13 Air Bag Module or RH Cowl Side Panel Air Bag Sensor Circuit Shorted to Ground 21 LH Cowl Side Panel Air Bag Sensor Not Mounted to Vehicle Properly 22 LH Cowl Side Panel Air Bag Sensor Circuit Shorted to Battery Voltage 23 LH Cowl Side Panel Air Bag Sensor Circuit Input Feed/Return Circuit Open 24 LH Cowl Side Panel Air Bag Sensor Diagnostic Circuit Open or Low Resistance in Center Air Bag or Front Air Bag 32 Driver Side Air Bag Circuit High Resistance or Open 33 Passenger Side Air Bag Circuit High Resistance or Open 34 Driver Side Air Bag Circuit Low Resistance or Shorted 35 Passenger Side Air Bag Circuit Low Resistance or Shorted 41 Center Radiator and RH Cowl Side Panel Air Bag Sensor Circuits High Resistance or Open 44 RH Cowl Side Panel Air Bag Sensor Not Mounted to Vehicle Properly 45 Center Air Bag Sensor Not Mounted to Vehicle Properly 46 Open Splice Center Air Bag Sensor Ground Monitor 51 Air Bag Diagnostic Monitor Internal Thermal Fuse Blown and Short to Ground No Longer Exists 52 Backup Power Supply Voltage Boost Fault 53 Sensor Circuits Resistance to Ground or Internal Air Bag Diagnostic Monitor Fault — Rapid Continuous Flashing of Air Bag Indicator