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1990 240 DL- have you checked the Crank Position Sensor (aka RPM Sensor) 200 1990

posted by  ZJZ on  Fri May 28 05:53 CST 2010
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last visit: Mon Oct 13 14:29 CST 2014
[RELATED]

Cranks but doesn't start - has the crank position sensor (CPS) been replaced at some point. It's located at the back of the engine, on top of the transmission tunnel. If the cable sheathing is frayed, that is likely to be the source of your hard starting problems. See this post (among many others) for some additional CPS-related discussion.

Here is Randy 'Lucid's canned CPS operation post -


=======(canned post)==========>

Start-Run Sequence

1) During starter cranking, the Crank Position Sensor (CPS) sends timing pulses to Ignition Control Unit (ICU)

2-a) The ICU uses these CPS pulses to trigger the Power Stage (aka Ignition Amplifier), which triggers spark from the coil.

2-b) At the same time, The ICU also propagates the pulses to the FI ECU, to allow FI operation.
==>(no ICU pulses means no FI operation)<==

3-a) The Fuel Injection (System)* relay (previously energized at Key On) powers the AMM, IAC, ECU, Injectors, and the Fuel (pump) relay coil + side.
* The System relay is in the white case with the Fuel relay.

3-b) When ICU pulses are received by the FI ECU, it "energizes" the Fuel relay by grounding the relay coil (– side) to run the fuel pumps.

When all these things work, the engine runs until the Ignition is switched off, which in turn shuts down the FI system.

<============(end canned post)======





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New 1990 240 DL- problem after problem [200][1990]
posted by  celise  on Thu May 27 12:32 CST 2010 >


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