2004 Skidoo ZX Series Service Manual, Page 324Get this manual
Section 06 ENGINES MANAGEMENT (2-TEC) Subsection 02 (COMPONENT INSPECTION AND ADJUSTMENT)
Install the tether cord cap, turn OFF engine cut-out switch and push STARTRER button momentarily to activate the ECMConnect voltmeter between pin and in the wiring harnessVoltage should be VCheck the continuity between pin on wiring harness TPS connector and pin 24 on wiring harness ECM connectorIf tests are good, replace the TPSIf voltage tests are not good, continue to check the resistance of the rest of the TPS circuit
Resistance Test
Reconnect the TPSDisconnect the connector DA from the ECM25 24
NOTE: When measuring between pins DA-24 and DA-39, resistance value increases while depressing throttle leverWhen measuring between pins DA-24 and DA-25, resistance value decreases while depressing throttle leverThe resistance value should change smoothly and proportionally to the throttle movementOtherwise, replace TPSIf resistance values are correct, try new ECMRefer to ECM REPLACEMENT procedures elsewhere in this sectionNOTE: Check if wiring harness shows any signs of scoring prior to replace the ECMIf resistance values are incorrect, repair connector or replace the wiring harness between ECM connector and the TPS