Discussion
My ABS warning dash board light came on six weeks ago on my 1992 Turbo and stayed on. It went in to the local dealers and they said I needed a new accumulator. They fitted one and I got nine miles before it came on again! It went back and they said it was the ABS box that contains all the valves? Two weeks of waiting for the part and when it was fitted it still did not work! Now it looks as if the factory may have to get involved as the dealership is clean out of ideas. Can any one help? The fault code I was told was 62. It could be totally unrelated but my electric aerial started to work for the first time in years!
I am no ABS expert, but a A062 is a "Test pump motor operation" and inspect Brake lines, brake hoses, master cylinder/booster assembly, pump/accumulator assembly and brake calipers for leakage.
From the manual:
G. PUMP MOTOR OPERATION
1. Turn off the ignition and depressurise the accumulator.
WARNING: Ensure the accumulator is fully depressurised (apply brake pedal hard and release up to
40 times with ignition off) before removing the accumulator.
Remove the accumulator and install pressure gauge TOOOT1112. Install accumulator on the pressure
gauge adaptor.
2 . Turn on the ignition and allow the pump to run for at least 20 seconds. Turn off ignition and check
for leaks, correcting as necessary. Depressurise the accumulator.
3 . Using the ‘Tech 1’ tool, perform the ‘Total Pump Run Time Test’. Observe the pressure gauge
while turning on the ignition. Is there a sudden jump from 0 to 3500 kPa (0 to 500 psi) or more
almost immediately after the ignition is turned on? (This initial jump in pressure is the amount of
accumulator precharge) If not, and the pump motor is running, perform step 9 of test D ‘Pump Run
Time Too Long’. If the jump in pressure is to less than 4150 kPa (600 psi), replace the accumulator.
4 . Note the pressure at which ‘Tech 1’ indicates “OK” pressure. If this pressure is not within the
11,700 to 13,100 kPa (1700 to 1900 psi) range, replace the accumulator pressure switch. Note
the pressure at which the pump turns off. If it is not within the 17,900 to 20,000 kPa (2600 to
2900 psi) range, replace the accumulator pressure switch. If the pump continues to run but maintains
a constant pressure, perform step 9 of test D ‘Pump Run Time Too Long’.
NOTE: When depressing the brake pedal to cause the pump to run, press the pedal slowly and
carefully until the pump just begins to run. Do not continue to press the pedal after the pump begins
to run, or pump run times which are too short may be missed.
5 . When the pump has stopped, press the brake pedal until the pump begins to run. If this pressure is
not within the 14,150 to 15,850 kPa (2050 to 2300 psi) range, replace the accumulator.
. . .
6 . If: accumulator pressure switch points are all within range, and; accumulator precharge is greater
than 4150 kPa (600 psi), and; battery voltage is greater than 11.8 volts when the pump is running:
if the total pump run time is greater than 40 seconds, replace the pump and motor assembly.
HTH.
Dr.Hess
From the manual:
G. PUMP MOTOR OPERATION
1. Turn off the ignition and depressurise the accumulator.
WARNING: Ensure the accumulator is fully depressurised (apply brake pedal hard and release up to
40 times with ignition off) before removing the accumulator.
Remove the accumulator and install pressure gauge TOOOT1112. Install accumulator on the pressure
gauge adaptor.
2 . Turn on the ignition and allow the pump to run for at least 20 seconds. Turn off ignition and check
for leaks, correcting as necessary. Depressurise the accumulator.
3 . Using the ‘Tech 1’ tool, perform the ‘Total Pump Run Time Test’. Observe the pressure gauge
while turning on the ignition. Is there a sudden jump from 0 to 3500 kPa (0 to 500 psi) or more
almost immediately after the ignition is turned on? (This initial jump in pressure is the amount of
accumulator precharge) If not, and the pump motor is running, perform step 9 of test D ‘Pump Run
Time Too Long’. If the jump in pressure is to less than 4150 kPa (600 psi), replace the accumulator.
4 . Note the pressure at which ‘Tech 1’ indicates “OK” pressure. If this pressure is not within the
11,700 to 13,100 kPa (1700 to 1900 psi) range, replace the accumulator pressure switch. Note
the pressure at which the pump turns off. If it is not within the 17,900 to 20,000 kPa (2600 to
2900 psi) range, replace the accumulator pressure switch. If the pump continues to run but maintains
a constant pressure, perform step 9 of test D ‘Pump Run Time Too Long’.
NOTE: When depressing the brake pedal to cause the pump to run, press the pedal slowly and
carefully until the pump just begins to run. Do not continue to press the pedal after the pump begins
to run, or pump run times which are too short may be missed.
5 . When the pump has stopped, press the brake pedal until the pump begins to run. If this pressure is
not within the 14,150 to 15,850 kPa (2050 to 2300 psi) range, replace the accumulator.
. . .
6 . If: accumulator pressure switch points are all within range, and; accumulator precharge is greater
than 4150 kPa (600 psi), and; battery voltage is greater than 11.8 volts when the pump is running:
if the total pump run time is greater than 40 seconds, replace the pump and motor assembly.
HTH.
Dr.Hess
Hi,
i had the abs light flashing for 2 weeks. I thought is the accumulator or pressure switch but before i tookit into a garage i thought it might be worth checking all connections. I pulled out all ABS related fuses and solenoid, made sure ok and cleaned contacts if necessary and unbelievably the flashing light disappeared. Worth a try as it costs nothing.
(has not flashed for 3 months)
dave s4
i had the abs light flashing for 2 weeks. I thought is the accumulator or pressure switch but before i tookit into a garage i thought it might be worth checking all connections. I pulled out all ABS related fuses and solenoid, made sure ok and cleaned contacts if necessary and unbelievably the flashing light disappeared. Worth a try as it costs nothing.
(has not flashed for 3 months)
dave s4
Hi
ok when the ABS system was playing up on my S4s the code was 062 (i think) anyway if you look at the schematic and work out how the system actually works its really quite simple,but Lotus throw in alot of variables and make it sound alot more 'Hi-Tech' than it really is ! Basically the upshot was the pressure switch was playing up,Lotus changed the 'upper' and 'lower' pressure parameters of the new switch as to not make it quite so sensitive to varying pressure fluctuations and spureous annoying flashing ABS lights.The new pressure switch has a grey body and the old one has a black body ,£57 from Lotus.I have had 2 switches in 2 years but in each case it was a dogey switch which has behaved itself for the last 8 months.Hope this is some help.
Nick S4s
ok when the ABS system was playing up on my S4s the code was 062 (i think) anyway if you look at the schematic and work out how the system actually works its really quite simple,but Lotus throw in alot of variables and make it sound alot more 'Hi-Tech' than it really is ! Basically the upshot was the pressure switch was playing up,Lotus changed the 'upper' and 'lower' pressure parameters of the new switch as to not make it quite so sensitive to varying pressure fluctuations and spureous annoying flashing ABS lights.The new pressure switch has a grey body and the old one has a black body ,£57 from Lotus.I have had 2 switches in 2 years but in each case it was a dogey switch which has behaved itself for the last 8 months.Hope this is some help.
Nick S4s
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